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The 4 interior angles of 4 sided quadrilaterals add up to 360 degrees The exterior angles of any polygon add up to 360 degrees
Interior angles = 176 degrees so exterior angles = 180 - 176 = 4 degrees. Sum of exterior angles = 360 so there must be 360/4 = 90 of them. It is a 90 sided polygon.
Interior angles of n-sided polygon total (2n - 4) right angles, in this case 16 x 90 degrees, so each angle is 16 x 90/10 ie 144 degrees. Exterior angle is 180 - 144 ie 36 degrees.
Interior angles total ((2 x 7) - 4) right angles which is 900 degrees. Exterior angles total 360 degrees. This is true of all convex polygons.
No, a polygon is a four straight-sided shape, thus only having 4 angles.