How is pi related to circles?

Answer 1

Pi is related to circles as it is used to measure the area, circumference, surface area and volumes of any 2-D or 3-D shape that has circles or circle-related surfaces.

In the case of area of a circle, it is measured as

pi x r x r, OR pi x r2 where r is the radius of the circle.

The relation between the radius and the circumference is also shown by by pi;

circumference / diameter ( or 2 x radius) = Pi

OR

circumference = pi x diameter

= 2 x pi x r

All related shapes like cones, cylinders, spheres, toruses, and even doughnuts can be measured using Pi.

Pi is usually given as 22/7, which doesn't even come that close. Another common value is 3.14, which is the cut off form of its value.