Solution
Let radius of semi circle = $$r$$ cm
=> Perimeter of semi circle = $$\pi r+2r=108$$
=> $$r(\frac{22}{7}+2)=108$$
=> $$r(\frac{22+14}{7})=108$$
=> $$r=108\times\frac{7}{36}$$
=> $$r=3\times7=21$$ cm
=> Ans - (D)
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