A lawn is in the shape of a semicircle of diameter 7 metre. It is surrounded by a flowerbed of width 0.7m all around. Find the area of the flowerbed in m^2
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Answer:
inner semicircle
r=3.5 m
outer semicircle
R=3.5+0.7=4.2m
area of flower bed =area of outer semicircle -area of inner semicircle
=πR^2/2-πr^2/2
π/2[R^2-r^2]
22/7×2(4.2×4.2 - 3.5×3.5)
=11/7(17.64 - 12.25)
=11/7(5.39)
=11×0.77
=8.47sq.m
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