www.regentsprep.org/regents/math/geometry/gg3/lpoly1.htm

Sum of Interior Angles of a Polygon. = 180(n - 2) (where n = number of sides) ...
Notice that a pentagon has 5 sides, and that 3 triangles were formed by ...

www.khanacademy.org/math/ab-sixth-grade-math/shape-space/triangles-polygons/v/sum-of-interior-angles-of-a-polygon

Showing a generalized way to find the sum of the interior angles of any polygon.
... the sum of the interior angles of a triangle; add up to 180 degrees; If the
measure ... 300 +240 = 540 degrees; To generalize it,; we have up to use up four
sides .... So if you divide a polygon into more than n-2 triangles, once you
subtract out ...

www.mathsisfun.com/geometry/interior-angles-polygons.html

The Interior Angles of a Triangle add up to 180° ... If it is a Regular Polygon (all
sides are equal, all angles are equal) ... Sum of Interior Angles = (n-2) × 180°.

www.dummies.com/how-to/content/interior-and-exterior-angles-of-a-polygon.html

You may need to find exterior angles as well as interior angles when working ... ...
The sum of the measures of the interior angles of a polygon with n sides is (n ...

www.bbc.co.uk/schools/gcsebitesize/maths/geometry/polygonsrev5.shtml

We already know how to find the sum of the interior angles of a polygon using the
formula. (n - 2) × 180°. We also know ... Interior angle of a regular polygon = sum
of interior angles ÷ number of sides ... Back to Geometry and measures index.

www.qc.edu.hk/math/Junior Secondary/interior angle.htm

Sum of Interior angles of an n-sided polygon. There are many ... The point P
chosen may not be on the vertex, side or inside the polygon. It can even be a
point ...

www.math.com/school/subject3/lessons/S3U2L1DP.html

We can use a formula to find the sum of the interior angles of any polygon. In this
formula, the letter n stands for the number of sides, or angles, that the polygon
has. ... by 180, the sum of the measures of all the interior angles in a triangle.

www.coolmath4kids.com/interior.html

The sum of the measures of the interior angles of a triangle is 180 degrees. Since
all ... If we had polygon with n sides... we'd be able to make (n - 2) triangles.

www.math-only-math.com/sum-of-the-interior-angles-of-a-polygon.html

Therefore, the sum of interior angles of a polygon having n sides is (2n – 4) right
... Find the sum of the measure of interior angle of a polygon having 19 sides.

www.cliffsnotes.com/study-guides/geometry/polygons/angle-sum-of-polygons

Theorem 39: If a convex polygon has n sides, then its interior angle sum is given
... is convex, then the sum of the degree measures of the exterior angles, one at ...