Question

The diameter of a semicirlce is 21 cm. Find its perimeter

Answer 1

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■ GIVEN
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diameter = 21cm

● radius = 21 / 2 = 10.5 cm

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Perimeter of a semicircle = 2pi r/2


= 2 × 22 × 21 / 7 × 2 × 2

● = 33cm


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Answer 2

Diameter=21 cm;Radius=10.5cm
$perimeter = \frac{1}{2} \times 2\pi \: r \\ = ( \frac{1}{2} \times 2 )\times 3.14 \times 10.5 \\ = 1 \times 3.14 \times 10.5 \\ =32.97 \: {cm}^{2}$
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