Question

Find the perimeter of a semi circle if diameter is 10cm

Answer 1

Perimeter of a circle = 2r x pie
= diameter x pie = 10 x 3.14 = 34.1 cm
Hope it helps
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Answer 2

☆d=2r

☆(10)=2r

☆r=5 cm

__________________

☆A=πr2
☆A=π(5 cm)2

☆C=2πr
☆C=2π(5 cm)

☆A=78.5 cm2
☆C=30.9 cm

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