Question

where 2πr formula is uses plzz answere

Answer 1

2pir is circumference of circle

Answer 2

Circumference Formula

The circumference formula is used to calculate the distance around a circle.

Circumference formulas:

C = 2πr or C = πd

r is the radius and d is the diameter.

The diameter is the longest chord that runs through the center of the circle. The radius is the measure of the distance from the center of the circle to a point on the circle. The diameter is 2 times the measure of the radius. If we want an exact answer, we use π. If we want to approximate, we use 3.14.