Question

if the circumference of a circle is 121cm. find its area

Answer 1

Circumference = 121 cm

=> 2 *pi *r = 121

=> 2*22*r/7 = 121

=> r = 121*7/22*2

=> r = 11*7 / 4

=> r = 77/4


Area = pi *r^2

= 22*77*77/7*4*4

= 11*11*77/8

= 121*77/8

= 9317/8

= 1164. 625 cm^2

Answer 2

hiii!!!

here's ur answer...

circumference of the circle = 121cm

therefore 2πr = 121cm

=> 2×22/7×r = 121cm

=> 44/7×r = 121cm

=> r = 121/1×7/44

=> r = 847/44

=> r = 19.25cm

VERIFICATION:-

circumference of circle = 2πr

= 2×22/7×19.25

= 847/7

= 121cm

hence verified

thus the radius of the circle is 19.25cm.

now,

area of the circle = πr²

= 22/7×19.25×19.25

= 8152.375/7

= 1164.625m²

hope this helps..!