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NCERT Solutions For Class 10 Maths Chapter 6 Triangles Ex 6.3

July 10, 2020 by Veerendra

Are you looking for the best Maths NCERT Solutions Chapter 6 Ex 6.3 Class 10? Then, grab them from our page and ace up your preparation for CBSE Class 10 Exams

Get Free NCERT Solutions for Class 10 Maths Chapter 6 Ex 6.3 PDF. Triangles Class 10 Maths NCERT Solutions are extremely helpful while doing your homework. Exercise 6.3 Class 10 Maths NCERT Solutions were prepared by Experienced LearnCBSE.in Teachers. Detailed answers of all the questions in Chapter 6 Maths Class 10 Triangles Exercise 6.3 provided in NCERT TextBook.

You can also download NCERT Solutions For Class 10 to help you to revise complete syllabus and score more marks in your examinations.

Free download NCERT Solutions for Class 10 Maths Chapter 6 Exercise 6.3 Triangles PDF in Hindi Medium as well as in English Medium for CBSE, Uttarakhand, Bihar, MP Board, Gujarat Board, AP SSC, TS SSC and UP Board students, who are using NCERT Books based on updated CBSE Syllabus for the session 2019-20.

  • Triangles Class 10 Mind Map
  • Triangles Class 10 Ex 6.1
  • Triangles Class 10 Ex 6.1 in Hindi Medium
  • Triangles Class 10 Ex 6.2
  • Triangles Class 10 Ex 6.2 in Hindi Medium
  • Triangles Class 10 Ex 6.3
  • Triangles Class 10 Ex 6.3 in Hindi Medium
  • Triangles Class 10 Ex 6.4
  • Triangles Class 10 Ex 6.4 in Hindi Medium
  • Triangles Class 10 Ex 6.5
  • Triangles Class 10 Ex 6.5 in Hindi Medium
  • Triangles Class 10 Ex 6.6
  • Triangles Class 10 Ex 6.6 in Hindi Medium
  • Extra Questions for Class 10 Maths Triangles
  • Triangles Class 10 Notes Maths Chapter 6
  • NCERT Exemplar Class 10 Maths Chapter 6 Triangles
  • Important Questions for Class 10 Maths Chapter 6 Triangles

You can also download the free PDF of Ex 6.3 Class 10 Triangles NCERT Solutions or save the solution images and take the print out to keep it handy for your exam preparation.

Board CBSE
Textbook NCERT
Class Class 10
Subject Maths
Chapter Chapter 6
Chapter Name Triangles
Exercise Ex 6.3
Number of Questions Solved 16
Category NCERT Solutions

NCERT Solutions For Class 10 Maths Chapter 6 Triangles Ex 6.3

NCERT Solutions for Class 10 Maths Chapter 6 Triangles Ex Ex 6.3 are part of Maths Class 10 NCERT Solutions. Here we have given NCERT Solutions for Class 10 Maths Chapter 6 Triangles Exercise 6.3

Question 1.
State which pairs of triangles in the given figures are similar. Write the similarity criterion used by you for answering the question and also write the pairs of similar triangles in the symbolic form :
NCERT Solutions for Class 10 Maths Chapter 6 Triangles 20
NCERT Solutions for Class 10 Maths Chapter 6 Triangles 21
Solution:
NCERT Solutions for Class 10 Maths Chapter 6 pdf Triangles Ex 6.3 Q1
NCERT Solutions for Class 10 Maths Chapter 6 pdf Triangles Ex 6.3 Q1.1

Question 2.
In the given figure, ∆ODC ~ ∆OBA, ∠BOC = 125° and ∠CDO = 70°. Find ∠DOC, ∠DCO and ∠OAB.
NCERT Solutions for Class 10 Maths Chapter 6 Triangles 25Solution:
Ex 6.3 Class 10 Maths NCERT Solutions PDF Q2

Download NCERT Solutions For Class 10 Maths Chapter 6 Triangles PDF

Question 3.
Diagonals AC and BD of a trape∠ium ABCD with AB || DC intersect each other at the point O. Using a similarity criterion for two triangles, show that \(\frac { OA }{ OC } =\frac { OB }{ OD^{ \bullet } } \)
Solution:
Ex 6.3 Class 10 Maths NCERT Solutions PDF Q3

Question 4.
In the given figure, \(\frac { QR }{ QS } =\frac { QT }{ PR } \) and ∠1 = ∠2. show that ∆PQR ~ ∆TQR.
NCERT Solutions for Class 10 Maths Chapter 6 Triangles 29Solution:
Ex 6.3 Class 10 Maths NCERT Solutions PDF Q4

Question 5.
S and T are points on sides PR and QR of ∆PQR such that ∠P = ∠RTS. Show that ∆RPQ ~ ∆RTS.
Solution:
Exercise 6.3 Class 10 Maths NCERT Solutions PDF Q5

Question 6.
In the given figure, if ∆ABE ≅ ∆ACD, show that ∆ADE ~ ∆ABC.
NCERT Solutions for Class 10 Maths Chapter 6 Triangles 33Solution:
Exercise 6.3 Class 10 Maths NCERT Solutions PDF Q6

Question 7.
In the given figure, altitudes AD and CE of ∆ABC intersect each other at the point P. Show that:
(i) ∆AEP ~ ∆CDP
(ii) ∆ABD ~ ∆CBE
(iii) ∆AEP ~ ∆ADB
(iv) ∆PDC ~ ∆BEC
NCERT Solutions for Class 10 Maths Chapter 6 Triangles 35Solution:
Exercise 6.3 Class 10 Maths NCERT Solutions PDF Q7

Question 8.
E is a point on the side AD produced of a parallelogram ABCD and BE intersects CD at F. Show that ∆ABE ~ ∆CFB.
Solution:
Triangles Class 10 Ex 6.3 NCERT Solutions PDF Q8

Question 9.
In the given figure, ABC and AMP are two right triangles, right angled at B and M respectively. Prove that:
NCERT Solutions for Class 10 Maths Chapter 6 Triangles 38
Solution:
Triangles Class 10 Ex 6.3 NCERT Solutions PDF Q9

Question 10.
CD and GH are respectively the bisectors of ∠ACB and ∠EGF such that D and H lie on sides AB and FE of ∆ABC and ∆EFG respectively. If ∆ABC ~ ∆FEG, show that
NCERT Solutions for Class 10 Maths Chapter 6 Triangles 40
Solution:
Triangles Class 10 Ex 6.3 NCERT Solutions PDF Q10
Triangles Class 10 Ex 6.3 NCERT Solutions PDF Q10.1

Question 11.
In the given figure, E is a point on side CB produced of an isosceles triangle ABC with AB = AC. If AD ⊥ BC and EF ⊥ AC, prove that ∆ABD ~ ∆ECF.
NCERT Solutions for Class 10 Maths Chapter 6 Triangles 43Solution:
Chapter 6 Maths Class 10 Ex 6.3 NCERT Solutions PDF Q11

Question 12.
Sides AB and BC and median AD of a triangle ABC are respectively proportional to sides PQ and QR and median PM of ∆PQR (see in given figure). Show that ∆ABC ~ ∆bPQR.
NCERT Solutions for Class 10 Maths Chapter 6 Triangles 45Solution:
Chapter 6 Maths Class 10 Ex 6.3 NCERT Solutions PDF Q12

Question 13.
D is a point on the side BC of a triangle ABC, such that ∠ADC = ∠BAC. Show that CA² = CB.CD.
Solution:
Chapter 6 Maths Class 10 Ex 6.3 NCERT Solutions PDF Q13

Question 14.
Sides AB and AC and median AD of a triangle ABC are respectively proportional to sides PQ and PR and median PM of another triangle PQR. Show that ∆ABC ~ ∆PQR.
Solution:
Ch 6 Maths Class 10 Ex 6.3 NCERT Solutions PDF Q14

Question 15.
A vertical pole of length 6 m casts a shadow 4 m long on the ground and at the same time a tower casts a shadow 28 m long. Find the height of the tower.
Solution:
Ch 6 Maths Class 10 Ex 6.3 NCERT Solutions PDF Q15

Question 16.
If AD and PM are medians of triangles ABC and PQR respectively, where
∆ABC ~ ∆PQR. Prove that \(\frac { AB }{ PQ } =\frac { AD }{ P{ M }^{ \bullet } } \)
Solution:
Class 10 Maths Chapter 6 Ex 6.3 NCERT Solutions PDF Q16

NCERT Solutions for Class 10 Maths Chapter 6 Triangles Ex 6.3 in Hindi Medium

Q1. बताइए कि आकृति 6.34 में दिए त्रिभुजों के युग्मों में से कौन – कौन से युग्म समरूप हैं | उस समरूपता कसौटी को लिखिए जिसका प्रयोग आपने उत्तर देनें में किया है तथा साथ ही समरूप  त्रिभुजों को सांकेतिक रूप  में व्यक्त कीजिए |

triangles class 10 in Hindi Medium Ex 6.3 Q 1

हल : (i) 

ΔABC तथा ΔPQR में

∠ABC = ∠PQR = 80°

∠BAC = ∠QPR = 60°

∠ACB = ∠PRQ = 40°

∴ AAA समरूपता कसौटी से

ΔABC ~ ΔPQR

हल : (ii) 

ncert solutions for class 10 maths chapter 6 Ex 6.3 in Hindi Medium
triangles class 10 Ex 6.3 in Hindi Medium

हल : (iii) 

ch 6 maths class 10

त्रिभुजों का यह युग्म समरूप नहीं है |

हल : (iv) 

triangles class 10 ncert solutions

त्रिभुजों का यह युग्म समरूप नहीं है |

हल : (v) 

similar triangles class 10

त्रिभुजों का यह युग्म समरूप नहीं है |

हल : (vi) 

triangle class 10

Q2. आकृति 6.35 में, ΔODC ~ ΔOBA, ∠BOC = 125o और ∠CDO = 70o  है | ∠DOC, ∠DCO और ∠OAB ज्ञात कीजिए |

chapter 6 maths class 10

हल : ∠DOC + ∠BOC = 180°  (रैखिक युग्म)

⇒ ∠DOC +125o = 180°

⇒ ∠DOC = 180° -125o

⇒ ∠DOC = 55o

अब ΔDOC  में,

∠DOC + ∠CDO + ∠DCO = 180°   (त्रिभुज के तीनों कोणों का योग)

⇒ 55o + 70o + ∠DCO = 180°

⇒ 125o ∠DCO = 180°

⇒ ∠DCO = 180° – 125o

⇒ ∠DCO = 55o

ΔODC ~ ΔOBA (दिया है)

∴ ∠OAB = ∠DCO = 55o

समरूप त्रिभुज के संगत कोण बराबर होते हैं|)

​Q3. समलंब ABCD, जिसमे AB || DC है, के विकर्ण AC और BD परस्पर O पर प्रतिच्छेद करते हैं | दो त्रिभुजों की समरूपता कसौटी का प्रयोग करते हुए,

ch 6 class 10 maths
class 10 maths chapter 6
class 10 triangles
maths ch 6 class 10
ncert solutions for class 10 maths chapter 6 triangles

Q5. DPQR की भुजाओं PR और QR पर क्रमश: बिंदु S और T इस प्रकार स्थित हैं कि ∠P = ∠RTS है | दर्शाइए कि ΔRPQ ~ ΔRTS  है |

ncert solutions class 10 maths chapter 6

हल:

दिया है : DPQR की भुजाओं PR और QR पर

क्रमश: बिंदु S और T इस प्रकार स्थित हैं

कि ∠P = ∠RTS है |

सिद्ध करना है : ΔRPQ ~ ΔRTS

प्रमाण : ΔRPQ तथा ΔRTS में,

∠P = ∠RTS   (दिया है )

∠R = ∠R      (उभयनिष्ठ)

A.A समरूपता कसौटी से

ΔRPQ ~ ΔRTS

Q6. आकृति 6.37 में, यदि ΔABE ≅ ΔACD है, तो दर्शाइए कि ΔADE ~ ΔABC है | 

triangle class 10 Ex 6.3 in Hindi Medium

Q7. आकृति 6.38 में, DABC के शीर्षलंब AD और CE परस्पर बिंदु P पर प्रतिच्छेद करते हैं तो दर्शाइए कि :  

(i) Δ AEP ~ Δ CDP
(ii) Δ ABD ~ Δ CBE
(iii) Δ AEP ~ Δ ADB
(iv) Δ PDC ~ Δ BEC

हल:

दिया है : DABC के शीर्षलंब AD और CE परस्पर बिंदु P पर प्रतिच्छेद करते हैं |

सिद्ध करना है :

(i) Δ AEP ~ Δ CDP
(ii) Δ ABD ~ Δ CBE
(iii) Δ AEP ~ Δ ADB
(iv) Δ PDC ~ Δ BEC

प्रमाण :

ncert solutions for class 10 maths chapter 6 pdf Ex 6.3 in Hindi Medium

(i)  Δ AEP तथा Δ CDP में,

∠AEP = ∠CDP  (प्रत्येक 90°)

∠APE = ∠CPD  (शीर्षाभिमुख कोण)

A.A समरूपता कसौटी से

Δ AEP ~ Δ CDP

cbse class 10 maths triangles ncert solutions

(ii) Δ ABD तथा CBE में

∠ADB = ∠CEB  (प्रत्येक 90°)

∠B = ∠B     (उभयनिष्ठ)

A.A समरूपता कसौटी से

Δ ABD ~ Δ CBE

(iii)  Δ AEP तथा Δ ADB में

∠AEP = ∠ADB  (प्रत्येक 90°)

∠A = ∠A     (उभयनिष्ठ)

A.A समरूपता कसौटी से

Δ AEP ~ Δ ADB

class 10 maths triangles

(iv) Δ PDC तथा Δ BEC में

∠PDC = ∠BEC  (प्रत्येक 90°)

∠C = ∠C     (उभयनिष्ठ)

A.A समरूपता कसौटी से

Δ PDC ~ Δ BEC

Q8. समान्तर चतुर्भुज ABCD की बढाई गई भुजा AD पर स्थित E एक बिंदु है तथा BE भुजा CD को F पर प्रतिच्छेद करती है | दर्शाइए कि Δ ABE ~ Δ CFB है | 

हल:

maths class 10 triangles

दिया है : ABCD एक समान्तर चतुर्भुज है जिसकी बढाई गई भुजा AD पर स्थित E एक बिंदु है तथा BE भुजा CD को F पर प्रतिच्छेद करती है |

सिद्ध करना है : Δ ABE ~ Δ CFB

प्रमाण : ABCD एक समान्तर चतुर्भुज है |

∠AEB = ∠CBE  …. (1) एकान्तर कोण

Δ ABE तथा Δ CFB में,

∠AEB = ∠CBE  समी० (1) से

∠A = ∠C  (समांतर चतुर्भुज के सम्मुख कोण)

A.A समरूपता कसौटी से

Δ ABE ~ Δ CFB

Q9. आकृति 6.39 में, ABC और AMP दो समकोण त्रिभुज है, जिसके कोण B और M समकोण हैं | सिद्ध कीजिए कि :

(i) Δ ABC ~ Δ AMP 

chapter 6 maths class 10

हल:

दिया है : ABC और AMP दो समकोण त्रिभुज है, जिसके कोण B और M समकोण हैं |

सिद्ध करना है :

(i) Δ ABC ~ Δ AMP

chapter 6 class 10 maths
ncert solutions class 10 maths chapter 6 Ex 6.3 in Hindi Medium Q 15

प्रमाण :

(i)     Δ ABC तथा Δ AMP में

∠ABC = ∠AMP  (प्रत्येक 90°)

∠A = ∠A     (उभयनिष्ठ)

A.A समरूपता कसौटी से

Δ ABC ~ Δ AMP

similarity of triangles class 10

(चूँकि समरूप त्रिभुज के संगत भुजाएँ समानुपाती होतीं हैं |)

Q10. CD और GH क्रमश: ∠ ACB  और ∠ EGF के ऐसे समद्विभाजक हैं कि बिंदु D और H क्रमश: Δ ABC और ΔFEG की भुजाओं AB और FE पर स्थित हैं | यदि Δ ABC ~ΔFEG है, तो दर्शाइए कि : 

chapter 6 class 10 maths
class 10 triangles solutions

(ii) Δ DCB ~ Δ HGE
(iii) Δ DCA ~ Δ HGF

हल:

दिया है : CD और GH क्रमश: ∠ ACB  और ∠ EGF के ऐसे समद्विभाजक हैं कि बिंदु D और H क्रमश: Δ ABC और ΔFEG की भुजाओं AB और FE पर स्थित हैं और ΔABC ~ ΔFEG है |

cbse class 10 maths triangles ncert solutions

(समरूप त्रिभुज के संगत कोण बराबर होते हैं |)

(i)     Δ ABC तथा Δ AMP में

(ii)  Δ DCB तथा Δ HGE में,

∠B = ∠E  समी० (2) से

∠BCD = ∠EGH  [चूँकि  ½∠C = ½∠G समी० (3) से ]

A.A समरूपता कसौटी से

Δ DCB ~ Δ HGE

(iii) Δ DCA तथा Δ HGF में
∠A = ∠F  समी० (1) से

∠ACD = ∠FGH  [चूँकि  ½∠C = ½∠G समी० (3) से ]

A.A समरूपता कसौटी से

Δ DCA ~ Δ HGF   Proved

Q11. आकृति 6.40 में, AB = AC वाले, एक समद्विबाहु त्रिभुज ABC की बढाई गई भुजा CB पर स्थित E एक बिन्दु है | यदि AD ⊥ BC और EF ⊥ AC है तो सिद्ध कीजिए कि ΔABD ~ ΔECF है |

हल:

दिया है : AB = AC वाले, एक समद्विबाहु त्रिभुज ABC की बढाई गई भुजा CB पर स्थित E एक बिन्दु है जिसमें AD ⊥ BC और EF ⊥ AC है

vedantu class 10 maths ncert solutions

सिद्ध करना है :

ΔABD ~ ΔECF

प्रमाण :

ΔABC में,

AB = AC दिया है;

∴ ∠B = ∠C    ……… (1) (बराबर भुजाओं के सम्मुख कोण ….)

अब, ΔABD तथा ΔECF में

∠ADB = ∠EFC (प्रत्येक 90°)

∠B = ∠C    समी० (1) से

A.A समरूपता कसौटी से

ΔABD ~ ΔECF    Proved

Q12. एक त्रिभुज ABC कि भुजाएँ AB और BC तथा माध्यिका AD एक अन्य त्रिभुज PQR की क्रमशः भुजाओं PQ और QR तथा माध्यिका PM के समानुपाती हैं (देखिए आकृति 6.41)| दर्शाइए कि ΔABC ~ ΔPQR है | 

हल:

दिया है : त्रिभुज ABC कि भुजाएँ AB और BC तथा माध्यिका AD एक अन्य त्रिभुज PQR की क्रमशः भुजाओं PQ और QR तथा माध्यिका PM के समानुपाती हैं |

similar triangles 10th class Hindi Medium 6.1 53

सिद्ध करना है :

ΔABC ~ ΔPQR

maths for 10 class

(चूँकि माध्यिकाएँ AD तथा PM BC तथा QR को समद्विभाजित करती हैं |)

theorems of triangles class 10 pdf Hindi Medium 6.3 55

Q13. एक त्रिभुज ABC की भुजा BC पर एक बिन्दु D इस प्रकार स्थित है कि ∠ADC = ∠BAC है | दर्शाइए कि CA2 = CB.CD है |

हल :

दिया है : त्रिभुज ABC की भुजा BC पर एक बिन्दु D इस प्रकार स्थित है कि ∠ADC = ∠BAC है |

NCERT Solutions For Class 10 Maths PDF Free Hindi Medium 6.3 56

सिद्ध करना है : CA2 = CB.CD

प्रमाण :

अब, ΔADC तथा ΔBAC में

∠ADC = ∠BAC ( दिया है )

∠C = ∠C    (उभयनिष्ठ)

A.A समरूपता कसौटी से

ΔADC ~ ΔBAC

NCERT Book Solutions For Class 10 Maths Hindi Medium 6.3 57(चूँकि समरूप त्रिभुज के संगत भुजाएँ समानुपाती होतीं हैं |)

या   CA2 = CB.CD  (बाई-क्रॉस गुणा करने पर)

Proved 

Q14. एक त्रिभुज ABC की  भुजाएँ AB और AC तथा माध्यिका AD एक अन्य त्रिभुज की भुजाओं PQ और PR तथा माध्यिका PM के क्रमशः समानुपाती हैं | दर्शाइए कि ΔABC ~ΔPQR है |

NCERT Textbook Solutions For Class 10 Maths Hindi Medium 6.3 58

हल : 

NCERT Books Solutions For Class 10 Maths PDF Hindi Medium 6.3 59

यहाँ माध्यिकाएँ समान अनुपात में हैं इसलिए समान अनुपात की माध्यिकायें जिस भुजा को समद्विभाजित करती है वह भी समानुपाती होता है

Download NCERT Solutions For Class 10 Maths Hindi Medium 6.3 60

Q15. लंबाई 6m वाले एक उध्वार्धर स्तम्भ की भूमि पर छाया की लंबाई 4m है, जबकि उसी समय एक मीनार की छाया की लंबाई 28 m है | मीनार की ऊँचाई ज्ञात कीजिए |

NCERT Solutions For Class 10 Maths 6.3 61
NCERT Solutions For Class 10 Maths PDF 6.3 62

NCERT Solutions for Class 10 Maths

  1. Chapter 1 Real Numbers
  2. Chapter 2 Polynomials
  3. Chapter 3 Pair of Linear Equations in Two Variables
  4. Chapter 4 Quadratic Equations
  5. Chapter 5 Arithmetic Progressions
  6. Chapter 6 Triangles
  7. Chapter 7 Coordinate Geometry
  8. Chapter 8 Introduction to Trigonometry
  9. Chapter 9 Some Applications of Trigonometry
  10. Chapter 10 Circles
  11. Chapter 11 Constructions
  12. Chapter 12 Areas Related to Circles
  13. Chapter 13 Surface Areas and Volumes
  14. Chapter 14 Statistics
  15. Chapter 15 Probability

We hope the NCERT Solutions for Class 10 Maths Chapter 6 Triangles Ex 6.3, help you. If you have any query regarding NCERT Solutions for Class 10 Maths Chapter 6 Triangles Exercise 6.3, drop a comment below and we will get back to you at the earliest.

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