find the area of a semicircle whose circumference is 18 cm
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Answer:
51.55
Step-by-step explanation:
circumference of semicircle = πr
=> 18 = 22/7*r
=> 18*7/22 = r
=> 63/11 = r
Now ,
Area of semicircle = 1/2πr^2
=> = 1/2 * 22/7 *63/11
=> = 567/11
=> = 51.55
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