Question

Calculate the perimeter of each part when a circle of radius 21 cm is divided into (a) two equal parts (b) four equal parts

Answer 1

Answer:

Step-by-step explanation: given radius of circle is 21 cm.

Now,if we divide circle into equal parts ,each part will be one semicircle.

Perimeter of circle=2πr

Perimeter of semicircle= 2πr/2

Since we divide circle into 2 parts.

Hence, perimeter of semicircle= (2*22/7*21)/2=66 cm

In same way if divide circle into 4 equal parts then each part will be quadrant.

Perimeter of circle=2πr

Perimeter of the quadrant=2πr/4

=πr/2

=22/7*21/2

=33cm