Question

5. If the area of a semi-circular region is 308 cm2, then its perimeter is:

(a) 36 cm (b) 44 cm (C) 88 cm (d) 72 cm​

Answer 1

Step-by-step explanation:

area of semi circle=π r²/2

=>308=π r²/2

=>308*2/22/7=r²

=>r²=196

=>r=14

we know that,

perimeter of semicircle=π r+2r

                                    =22/7*14+2*r

                                    =44+28

                                    = 72m.

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Answer 2

Answer:

b. 44

Step-by-step explanation:

since area of circle = πr2

area of semicircle = πr2/2

according to question-

πr2/2= 308

π× r2=308×2

22/7 ×r2 = 308×2

r2 = 308×2×7/22

r2 = 28×2×7/2

r2 = 28×7

r2= 196

r=√196

=14

perimeter of a semicircle = 2πr/2=πr

22/7×14= 22×2 =44cm