Q.4. If area of semicircular region is 1232 sq cm , find its perimeter.
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Q.4. If area of semicircular region is 1232 sq cm , find its perimeter.
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Area of the semicircular region=1232cm²
Area of a semicircle----
=>22/7×r²/2=1232
=>22/7r²=1232×2
=>22/7r²=2464
=>r²=(2464×7)/22
=>r²=784
=>r=28 cm
Perimeter of a semicircle----
=>22/7×28
=>88cm