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pi r + 2 r = r (2 + pi) Perimeter of circle = pi d = 2 pi r But you have half a circle so it's "pi r" But don't forget about the straight edge = 2r ------------------------------------------- Think of perimeter as the amount of material or the length of the "line" that you will need to draw...

8 Answers · Science & Mathematics · 24/07/2009