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/geometry/hs-geo-foundations/hs-geo-polygons/v/sum-of-interior-angles-of-a-polygon

Learn how to find the sum of the interior angles of any polygon. ... Practice:
Finding angle measures 1 · Practice: Finding angle measures 2 · Sum of interior ...

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.mathopenref.com/polygoninteriorangles.html

... and repeat. Note the behavior of the interior angles and their sum. ... So for a
polygon with N sides, there are N vertices and N interior angles. For a regular ...

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.mathwarehouse.com/geometry/polygon/

What is the sum measure of the interior angles of the polygon (a pentagon) on
the left? ... Formula to find 1 angle of a regular convex polygon of n sides = a.

www.geom.uiuc.edu/~dwiggins/conj07.html

Conjecture (Polygon Sum Conjecture): The sum of the interior angles of any
convex n-gon (polygon with n sides) is given by (n-2)*180. Corollary (Angle
Measures for Regular n-gons): The measure of each of the n angles in a regular
n-gon is ...

www.maplesoft.com/support/help/Maple/view.aspx?path=MathApps/SumofInteriorAnglesOfAPolygon

For example, a triangle has three interior angles, with a sum of 180. As the
number of sides, n , of a polygon increases, the sum of its interior angles,...

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 ...

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.