find the perimeter of each figure
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1. we know that perimeter of circle = 2πr and here r = 21m ⇒ 2πr = 131.946
but the given figure is 1/4th of the circle ⇒ so perimeter = 131.946/4 = 33
2. we know that perimeter of circle = 2πr and here r = 0.7m ⇒ 2πr = 4.398
but the given figure is 3/4th of the circle ⇒ so perimeter = 3/4 × 4.398 = 3.298
3. Perimeter of the triangle = 7 + 7 + 10.5 = 24.5
Perimeter of the semicircle is πr = 16.5
so total perimeter = 24.5 + 16.5 =41
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Answer of ques 12, part - (iii)
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