Circles, perimeter and area · वृत्त, परिमाप और क्षेत्रफल
A free Maths lesson for Class 7 children.
Every point on a circle is the same distance from its centre.
The radius joins the centre to the circle. The diameter is twice the radius.
A chord joins two points on the circle. The diameter is the longest chord.
A tangent touches the circle at just one point.
The distance around a circle is its circumference. It is two times pi times the radius.
The area of a circle is pi times the radius squared.
Pi is a little more than three. We often take it as twenty-two by seven.