Solution
Let radius of semi circle = $$r$$ cm
=> Perimeter of semi circle = $$\pi r+2r=36$$
=> $$r(\frac{22}{7}+2)=36$$
=> $$r(\frac{22+14}{7})=36$$
=> $$r=36\times\frac{7}{36}$$
=> $$r=1\times7=7$$ cm
=> Ans - (A)
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