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If three of the angles of a quadrilateral are right angles, then the fourth angle must also be a right angle.

The sum of the interior angles of any two-dimensional (planar) geometric figure must add up to 360 degrees. As this is the case, three times 90 equals 270, and 270 subtracted from 360 leaves 90.

The quadrilateral described here is a rectangle. If all the sides are the same length, it is a special case of a rectangle that we call a square.

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