Question

Find the diameter of a circle having the area 1386m².

Answer 1

Area of circle = 1386 cm²

Formula = πr²

πr² = 1386
r² = 1386 x 7/22
r² = 63 x 7
r² = 441
r = 21 cm

Diameter = 2r = 2 x 21 = 42 cm

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Answer 2

Hi friend,
Area of circle = π r^2
1386 m ^ 2 = 22/7 × r^ 2
1386×7/22 m = r^2
441 m = r^2
21 m = radius

Diameter = 2× radius
diameter = 2× 21m
diameter = 42 m
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