Question

If the perimeter of a semicircle is 144cm then its area is ________ sq cm.

Answer 1

given 2πr=144
2×22/7×r=144 cm
r=7/44×144cm
r=21.3cm
area of a semi circle =1/2 πr²
1/2×22/7×21.3×21.3
=70.29/2 cm²

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Answer 2

Answer:

The perimeter of semicircle is 144 cm, which is equal to 2r + (pi)r, where r= radius. 2r + (pi)r = r(14+22)/7 = r(36/7) so r = 144*7/36 = 28 cm. The area of the semicircle is = (22/7)*28^2/2 = 1232 sq cm.

Step-by-step explanation:

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