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September 21, 2014

September 21, 2014

Posted by **Monica** on Monday, November 22, 2010 at 11:41am.

Find the measure of each angle

How mant sides does this polygon have?

- Geometry -
**Reiny**, Monday, November 22, 2010 at 11:53amLook at a pair of interior and exterior angles.

Don't they form a straight line, so

13x-33 + x+3 = 180

14x = 210

x = 15

each exterior angle is 18°

and each interior is 162°

the sum of all exterior angles is always 360

so each angle is 360/18 or 20 angles

20 angles ----> 20 sides

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