Areas Related to Circles Formulas CBSE Class 10 Maths Circumference of a Circle or Perimeter of a Circle The distance around the circle or the length of a circle is called its circumference or perimeter. Circumference (perimeter) of a circle = πd or 2πr, where d is a diameter and r is a radius of the circle and π = Area of a circle = πr2 Area of a semicircle = … [Read more...]