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Activity Discussion Math Circle

• # Circle

Posted by on June 23, 2023 at 4:34 pm

What will be the circumference of a circle whose area is 616 cm sq.?

replied 11 months, 1 week ago 3 Members · 2 Replies
• 2 Replies
• ### Pooja

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June 23, 2023 at 4:49 pm
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Given: Area of a circle(A)=616 sq.cm

To find : Circumference of circle(c)

Solution:Area of a circle

A= Ï€r^2

Where r is the radius of a circle

616=(22/7) r^2

r^2=616*(7/22)=28*7=196

r^2=196

Taking square root on both the sides, we get

r=14

Thus, circumference of the circle is

c= 2Ï€r=2*(22/7)*14=88

• ### Saloni

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June 23, 2023 at 4:50 pm
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Circumference of a circle is given by: P=2*pi*radius

Area of a circle is given by: A=pi*radius^2

Given, area of the circle A=616 cm sq.

i.e. pi*radius^2=616

=> radius^2=196.078

=> radius=14 cm

Therefore,

Circumference=2*pi*14

=87.96 cm

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