Question

Circumference of semicircles

Answer 1

Answer:

$πr$is the answer...

Answer 2

Semicircle

Circumference and perimeter are same

The perimeter of a circle is π × d where d is the diameter so half of that is 1/2 π × d. But If you are going to walk around a semicircle you need to go half way around the circle and then across a diagonal to get back to where you started so the perimeter is 1/2 π × d + d.

It can also be written as  πr+d 

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