find perimeter rectangle with semicircle
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width =6m
length=12m
perimeter of rectangle =2(l+b)
=2(6+12)
=2×18=36m-6m=30
radius of semicircle =6/2=3m
perimeter of semicircle=(22/7)×3
=66/7m
total perimeter=30+66/7=276/7m
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