It means the sum of the angles measurement.
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angle sum of a parallelogram
Because the angle sum of all quadrilaterals is 360 degrees.
The sum of the three interior angles of a triangle is always 180 degree is known as angle sum property of a triangle.
the sum of the angle in a octagon is 1080
The sum of the angles of a triangle is 180 degrees. A right angle is 90 degrees. So the sum of the remaining two acute angles of a right triangle is 90 degrees.