The 4 interior angles of a parallelogram add up to 360 degrees
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angle sum of a parallelogram
Being a quadrilateral, the sum of all four angles is 360o.Opposite angles of a parallelogram are equal.Adjacent angles of a parallelogram are supplementary, that is add to 180o.Given one angle of a parallelogram, the other 3 angles can be calculated:the opposite angle is the same;the other two angles are the same as each other and are 180o - the_given_angle
Yes a parallelogram with a right angle is a square.
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A parallelogram with one right angle has four of them. The name for this figure is a rectangle.