a lawn is in the shape of a semicircle of diameter 7 metre.it is surrounded by a flower bed of width 0.7m all around.find the area of flower bed in m^2.

Radius of semicircle = 72=3.5 mNow it is surrounded by flower bed of width 0.7 cmSo radius including flower bed R= 3.5+0.7=4.2 mNow area of lawn = πr22=227×12×3.5×3.5=11×0.5×3.5=19.25 m2Area including flower bed =πR22=227×12×4.2×4.2=11×0.6×4.2=27.72 m2So area of flower bed =27.72- 19.25=8.47 m2

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92.4 m2
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