A square has 4 right angles, one at each corner. A right angle is 90o...
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A square has 4 90 degree angles in the inside. The sum of all the inside angles of a square is 360 degrees.
The 4 interior right angles inside a square add up to 360 degrees
The sum of the interior angles of a decagon is 1440 degrees The sum of the interior angles of a triangle is 180 degreesThe difference in the sum of the interior angles of a decagon compared to a triangle = 1440 degrees minus 180 degrees = 1260 degrees
-- The sum of the four exterior angles is 360 degrees. -- The sum of the four interior angles is also 360 degrees. -- So the sum of all the interior and exterior angles is 720 degrees.
The sum of the four interior angles of a trapezoid is 360 degrees.