Question

The circumference of a circle having area 616 sqcm

Answer 1

Given :

Area of circle = 66 cm²

Area of circle = πr²

66= πr²

616 = (22/7) × r²

616×7 = 22 r²

196 = 22r²

r²= 196

r=√196

r = 14cm

circumference of circle = 2πr

= 2 × (22 / 7 )× 14

= 44 × 2

= 88 cm

Hence, the circumference of the circle = 88cm

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Hope this will help you...

Answer 2

Area of a circle = 616 cm²
We have to calculate the circumference of a circle.
We know that,
Circumference of circle = 2 π r  ......... (1)
To find the circumference of a circle, first we have to calculate the radius "r" of a circle.
Since,
Area of circle = π r² 
 616 =  π r²  
616 = (3.14) r²
r² = 616 / 3.14
r² = 196
r = √ 196
r = 14
Put this value of "r" in Eq. (1)
Circumference of circle = 2 π r
Circumference of circle = 2 (3.14) (14)
Circumference of circle = 87.9 cm
Thus, the circumference of the circle is 87.9 cm