How do I find the perimeter of a semi circle with an 18 cm base?

If the base is 18 cm, then the diameter of the semi-circle is 18. The perimeter is half a circle plus 18, or (1/2)pi(18) + 18 9pi + 18 cm or approx. 46.274 cm Be careful, you need to include the base segment as part of your perimeter.

The other answers are only including the length of the half-circle. More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.