Question

find the radius and the perimeter of a circle whose area is 12.32cm square

Answer 1

given ,

area of circle= 12.32 cm^²

πr^²= 12.32

R^²= 12.32×7/22= 3.92

r= √3.92= 1.96 approx

now perimeter of circle= 2πr

2×22/7×1.96= 12.32

perimeter= 12.32

hope it help you

Answer 2

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Let the radius of the circle is r cm
Area of circle is 12.32 sq cm
AS we know that
Area of circle = π r^2
$12.32 = \frac{22}{7} \times r {}^{2} \\ r {}^{2} = \frac{12.32 \times 7}{22} \\ r {}^{2} = 3.92 \\ r = \sqrt{3.92} \\ r = 1.97 \: cm$
Now Perimeter of the circle = 2π r
$= 2 \times \frac{22}{7} \times 1.97 \\ = 12.38 \: cm$
The radius of the circle is 1.97cm
The perimeter of the circle is 12.38 cm


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