If the 20-sided polygon is a regular polygon, then:
The sum of all 20 angles = (20 - 2)180⁰ = 18(180⁰) = 3240⁰
Each angle measure = 3240⁰/20 = 162⁰
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The interior angles of a 20 sided polygon add up to 3240 degrees
The interior angles of an x-sided polygon would be: (x - 2) * 180. (20 - 2) * 180 = 3,240
It is a regular 20 sided polygon
The sum of the interior angles in a n-sided polygon is (n-2) x 180o. For a 20 sided polygon: sum_interior_angles = (20 - 2) x 180o = 18 x 180o = 3240o.
3240o. The sum of the interior angles of a n sided polygon is sum = (n - 2) x 180o An icosagon has 20 sides, thus the sum of its interior angles is: sum = (20 - 2) x 180o = 3240o