360 degrees.
Remember for each polygon, for each additional side add 180 degrees.
Hence
triangle(3) = 180
Quadrilateral(4) = 360
Pentagon(5) = 540
Hexagon(6) = 720
Heptagon(7) = 960
Octagon(8) = 1140
Nonagon(9) = 1320
Decagon(10) = 1500
et.seq.,
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Use a protractor but in general thr 4 interior angles of any quadrilateral add up to 360 degrees
-- The sum of the four exterior angles is 360 degrees. -- The sum of the four interior angles is also 360 degrees. -- So the sum of all the interior and exterior angles is 720 degrees.
The sum of the internal angles always equals 180o
The sum of the interior angles is 360.
Sum of interior angles of an octagon= 1080˚