Squares and rectangles always do.
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Because it has 4 equal sides and 4 equal angles of 90 degrees.
If all of its exterior angles are 90 degrees then it will have 4 sides
90 degrees per side, 4 angles
90 x (2 x 15 - 4) ie 90 x 26 = 2340o. The sum of the interior angles of an n-sided polygon always is 90 x (2n - 4) degrees
it depends what kind of polygon but the sum of the angles will equal a # divisible by 90