The perimeter and area of semi circular plate of radius 25 cm are

Class: 10

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128.5 cm , 981.25 cm2

188.5 cm , 981.25 cm2

580 cm , 72 cm2

620 cm , 80 cm2

answer is A.

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Detailed Solution

We have radius of semicircle = 25 cm
the perimeter of semicircle = C
⇒ the semicircular arc + the diameter
⇒ πr + 2r
C = r(π + 2) = 25(3.14 + 2)
= 128.5 cm
Area of semicircle = A = when r = radius of circle
⇒
Hence option (3) is correct.

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