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If the perimeter of a semicircle is 18cm, what will be it's diameter
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If the perimeter of a semicircle is 18cm, what will be it's diameter
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Answer:
7 cm
Step-by-step explanation:
Given, Perimeter of semi-circle = 18 cm.
We know that Perimeter of semicircle = Diameter + πr
⇒ 18 = 2r + πr
⇒ 18 = r(2 + π)
⇒ 18 = r(2 + 22/7)
⇒ 18 = r(36/7)
⇒ 126 = 36r
⇒ r = 3.5 cm.
We know that Diameter = 2r = 7 cm.
Hope it helps!