Answer: 2 answers I explain below
Explanation:
First Explenation:
Suppose a circle has a radius 'r' then the area of circle = πr2 or πd2/4 in square units, where π = 22/7 or 3.14, and d is the diameter. Area of a circle can be calculated by using the formula Area = π × r2, where 'r' is the radius.
Second Explenation: The easiest thing to start with would be to take the ruler and measure, from the very center of the circle, the length between the outer edge. That would be the diameter. Now take 1/2 of the diameter and that is Radius.
Hope this helps it was a Difficult Question