Question

Find the perimeter of a circle
of radius 21cms​

Answer 1

Answer:

perimeter of the circle 2πr ,where r is the radius of the circle

so, perimeter=2.22/7.21 cm

=2.22.3 cm

=132cm

Answer 2

Answer:

TSA of spere is 4πr²

= 4×22/7×21

= 264cm²