Question

# What is the formula to find the perimeter of a semicircle with radius $$r$$?

A
πr
B
2πr
C
r(π+2)
D
2(π+r)

Solution

## The correct option is D $$r(\pi+2)$$Circumference of a circle $$=2\pi r$$Circumference of semi circle $$=\dfrac{2\pi r}{2}=\pi r$$$$\therefore$$ The length of curved line is $$\pi r$$The length of straight line(diameter)$$=2r$$The total perimeter of a semi circle is $$\pi r +2r=r(\pi +2)$$Maths

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