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/polygons07heptagons.html

geometry  drwls, Thursday, July 12, 2012 at 7:19pm
The sum of the interior angles of a polygon with N sides is
180*(N2) 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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