To get this answer, type in tan(28) in your calculator. It should come out to be about .532. Make sure your calculator is in Degree mode.
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90 - 28 = 62 degrees.
It is an acute angle. All angles from 1 - 89 degrees are acute. A 90 degree angle is a right angle. Angles from 91 - 179 are obtuse angles.
An angle of 28 degrees is an acute angle because it is greater than 0 but less than 90 degrees
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The easiest way to calculate this is to calculate the exterior angle and use the fact that the exterior and interior angles are supplementary. Sum exterior angles = 360° → Each exterior angle of a regular 28-agon is 360° ÷ 28 → Each interior angle of a regular 28-agon = 180° - 360° ÷ 28 = 167 1/7° ≈ 167.14°