The perimeter of semicircle is 108 cm. What is the area of semicircle
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Answered by
45
Perimeter of semicircle=2r + π r
( The question is telling us perimeter not the circumference. Both terms are totally different.)
Perimeter=108 cm
So, r(2+π)=108
r(2+22/7)=108
r* 36/7 =108
r=108 * 7 /36
r=21 cm
Area of semicircle= π r^2/2
22/7 * 21*21/2
= 22 * 3 *21 /2
=11 * 3 * 21
= 693 cm^2
Answer- The area of semicircle is 693 cm^2.
Answered by
9
Answer:
Step-by-step explanation:
Perimeter=108 cm
So, r(2+π)=108
r(2+22/7)=108
r* 36/7 =108
r=108 * 7 /36
r=21 cm
Area of semicircle= π r^2/2
22/7 * 21*21/2
= 22 * 3 *21 /2
=11 * 3 * 21
= 693 cm^2
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