Question

if area of a circle is 38.5 square cm find its circumference

Answer 1

22cm

Area of circle = 38.5 sq cm

That is πr2 = 38.5

r2 = 38.5 × (7/22) = 12.25

Therefore, r = 3.5 cm

Circumference of circle = 2πr

= 2 x (22/7) x 3.5

= 22 cm

Answer 2

✔️✔️We know that the area of circle =A=πr²


⭕️Circumference=C=2πr


π=22/7


✔️✔️Area of circle :-


= 38.5 sq cm

=πr2 

= 38.5 r2 

= 38.5 × (7/22)

= 12.25 


✔️✔️Therefore, r = 3.5 cm.....


✔️✔️therefore the  Circumference of circle will be :-


= 2πr 

= 2 x (22/7) x 3.5 

= 22 cm



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