Question

if radii of two concentric circles are 28cms and 18cms respectively. if the perimeter and the area of the circles are numerically equal. the find the radius of the circle

please help me as fast you can ​

Answer 1

Given,

The perimeter and the area of the circle are equal.

To find,

The radius of the circle.

Solution,

We can simply solve this mathematical problem by using the following mathematical process.

Let, the radius of the circle = r unit

Area of the circle = πr² sq. unit

Perimeter of the circle (circumference) = 2πr cm

According to the data mentioned in the question,

πr² = 2πr

πr²/πr = 2

r = 2

Hence, the radius of the circle is 2 units