Posted by **Nicki** on Thursday, July 12, 2012 at 7:05pm.

You have a heptagon with the following interior angles 125, 130, 175, 105, 165, 25. What's the measurement of the 7th angle and why?

- Mte 181 -
**Ms. Sue**, Thursday, July 12, 2012 at 7:15pm
900 - (125 + 130 + 175 + 105 + 165 + 25) = ?

http://www.coolmath.com/reference/polygons-07-heptagons.html

- geometry -
**drwls**, Thursday, July 12, 2012 at 7:19pm
The sum of the interior angles of a polygon with N sides is

180*(N-2) degrees.

A heptagon has N=7 sides, so the sum is 900 degrees.

The seventh angle must be

900-(125 +130 + 175 + 105 + 165 + 25)

= 175 degrees

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