circumference or perimeter of the semicircle = (diameter*pi)/2 + diameter.
http://wiki.answers.com/Q/What_is_the_circumferenc...

= pi x r + 2 x r = r (pi +2)
http://answers.yahoo.com/question/index?qid=200710...

Find the circumference of the whole circle and divide by two.C = 2╥r then divide by two Anonymous
http://www.blurtit.com/q4688015.html

The Length Of The Thick Semicircle is 15+30/pi=24.55 m. Anonymous
http://www.blurtit.com/q9470706.html
