Question

find the area and perimeter of semicircle of radius 7cm

Answer 1

Given , radius of semicircle = 7 cm

Find the area of semicircle:
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since , we know that area of semicircle

= area of circle / 2

= πr^2 / 2 = ( 22/ 7 ) × (7)^2/ 2

22 × 7 / 2 = 77 cm^2

Find the perimeter of semicircle:
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perimeter of semicircle = circumference of semicircle + diameter of semicircle

= πr + 2r

= (22/ 7) × 7 + 2 × 7

= 22 + 14 = 36 cm

therefore, are of semicircle = 77 cm^2

perimeter of semicircle = 36 cm

Answer:area=77cm^2, perimeter=36 cm
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Answer 2

the perimeter is 36 cm

pi r + 2r

22/7×7+2×7

22+14

36 cm