Question

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

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