How do you find the measure of each interior angle of a polygon?

1 Answer
Jan 22, 2016

Without more information, you can only find the value of the interior angles of a regular polygon. Using the equation is #((n-2)180^@)/n# where #n# is the number of sides of the regular polygon

Explanation:

A regular polygon refers to a multi-sided convex figure where all sides are equal in length and all angles have equal degree measures.

https://www.cliffsnotes.com/study-guides/geometry/polygons/classifying-polygons

http://proofsfromthebook.com/2012/11/28/sum-of-exterior-angles/

The regular triangle has 3 interior angles of #60^@# and 3 exterior angles of #120^@#. The exterior angle have a sum of #360^@ =(3)120^@#

The square has 4 interior angles of #90^o# and 4 exterior angles of #90^@#. The exterior angles have a sum of #360^@ =(4)90^@#.

The pentagon has 5 interior angles of #108^o# and 5 exterior angles of #72^@#. The exterior angles have a sum of #360^@ =(5)72^@#.

In order to find the value of the interior angle of a regular polygon, the equation is #((n-2)180^@)/n# where n is the number of sides of the regular polygon.

Triangle: #" "((3-2)180^@)/3 = 60^@#

Square #" "((4-2)180^@)/4 = 90^@#

Pentagon #" "((5-2)180^@)/5 = 108^@#