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Visualising Solid Shapes Class 8 Notes Maths Chapter 10

January 24, 2024 by Sastry CBSE

CBSE Class 8 Maths Notes Chapter 10 Visualising Solid Shapes Pdf free download is part of Class 8 Maths Notes for Quick Revision. Here we have given NCERT Class 8 Maths Notes Chapter 10 Visualising Solid Shapes.

CBSE Class 8 Maths Notes Chapter 10 Visualising Solid Shapes

Solids have a fixed shape and occupy a space.

A solid is made up of polygonal regions, which are called its faces.

Polyhedron: A solid shape bounded by polygons is called polyhedron (platonic solid).

A polyhedron has some number of plane faces, edges and vertices, which satisfy the relationship:
F + V – E = 2,
where
F stands for the number of faces.
V stands for the number of vertices
and E stands for the number of edges.
The relation F + V – E = 2 is called Euler’s formula.

Prism: A prism is a solid, whose side faces are parallelograms and whose ends (or bases) are congruent parallel polygons.
A prism has 2 triangular faces, 3 rectangular faces, 6 vertices and 9 edges.

Pyramid: A pyramid is a polyhedron whose base is a polygon of any number of sides and whose other faces are triangles with a common vertex.
A pyramid has 1 square face, 4 triangular faces, 5 vertices and 8 edges.

Tetrahedron: A pyramid is called a triangular pyramid if its base is a triangle. A triangular pyramid is also called a tetrahedron.

Plane shapes have two dimensions (measurements) like length and breadth whereas a solid object has three measurements like length, breadth and height (or depth). That is why they are called two-dimensional shapes and three-dimensional shapes, respectively. They are briefly named as 2-D and 3-D figures, respectively. Triangle, rectangle, circle, etc., are 2-D figures whereas cube, cylinder, cone, sphere, etc., are 3-D figures.

Views of 3-D Shapes
3-dimensional objects look differently from different positions. So, they can be drawn from different perspectives like top view, front view, side view.

Mapping Space Around Us
A map is different from a picture. A map depicts the location of a particular object/place in relation to other objects/places. Symbols are used to depict different objects/places. There is no reference or perspective on a map. However, perspective is very important for drawing a picture. Moreover, maps involve a scale which is fixed for a particular map.

Faces, Edges and Vertices
A solid shape bounded by the polygon is called a polyhedron. The plural of the word polyhedron is polyhedra.

Faces are polygonal regions with which a polyhedron is made up. The line segments in which the faces of a polyhedron meet are called edges. The points of intersection of the edges of a polyhedron are called its vertices. In a polyhedron, three or more edges meet at a vertex.

A polyhedron is said to be regular if its faces are made up of regular polygons and the same number of faces meet at each vertex.

A prism is a polyhedron whose base and top are parallel congruent polygons and whose lateral faces are parallelograms in shape.

A pyramid is a polyhedron whose base is a polygon (of any number of sides) and whose lateral faces are triangles with a common vertex.

We hope the given CBSE Class 8 Maths Notes Chapter 10 Visualising Solid Shapes Pdf free download will help you. If you have any query regarding NCERT Class 8 Maths Notes Chapter 10 Visualising Solid Shapes, drop a comment below and we will get back to you at the earliest.

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