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# semicircle

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http://prntscr.com/msnqaf

Mar 3, 2019

#2
+4569
+2

The perimeter of the semi-circle is half the circumference plus the diameter.

In this case, we have three as the radius, so the diameter is 6 inches long, and the perimeter around the arc is $$\frac{2\pi*3}{2}=3\pi.$$ Thus, the answer is $$\boxed{3\pi+6}.$$

Mar 3, 2019

#1
+111326
+2

Semi-circle perimeter =   pi * radius   =

pi * 3 =

3 pi  cm

EDIT....see tertre's answer below.....mine is flawed!!!

Mar 3, 2019
edited by CPhill  Mar 3, 2019
#2
+4569
+2

The perimeter of the semi-circle is half the circumference plus the diameter.

In this case, we have three as the radius, so the diameter is 6 inches long, and the perimeter around the arc is $$\frac{2\pi*3}{2}=3\pi.$$ Thus, the answer is $$\boxed{3\pi+6}.$$

tertre Mar 3, 2019
#3
+111326
+1

Ah....thanks, Tetre.....I always forget that they want the perimeter of the whole sector....not just the "curved" part

CPhill  Mar 3, 2019
#4
+4569
+1

I sometimes forget that, too!

Thank you!

tertre  Mar 3, 2019