Exterior angles always add up to 360 degrees. Assuming the 17-gon is regular, one exterior angle would be 360/17 which is around 21.176.
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180 - interior angle = exterior angle
a circle = 360 degrees , so 360 - straight angle = exterior angle
measure of exterior angle of triangle is equal to sum of interior angles. for eg. In triangle ABC, angle C is exterior angle angle A and angle B are interior angles so, C=A+B
Each interior angle of a decagon is 144 degrees.An exterior angle is 180 - measure of interior angle.There exterior angle of decagon is 180-144which is equal to-36
No.Take a look at this picture...http://www.onemathematicalcat.org/Math/Geometry_obj/graphics/summing_exterior_angles.pngThe exterior angle + the interior angle = 180 degrees180 - the interior angle = the exterior angle