A polygon with any number of sides can have a 156 degree angle, as can most non-polygonal plane shapes.
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A 60 degree angle is an acute angle because it is greater than 0 but less than 90 degrees.
A right angle triangle has one 90 degree angle and two acute angles
A right angle.
Rotation preserves shape - therefore the angle before the rotation equals the angle after the rotation.
No. An octagon is a 2-dimensional closed polygonal shape: it is NOT an angle.