A kite or arrowhead.
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Angles that are congruent and supplementary must be right angles.
A rectangle and a square are two types of quadrilaterals having four equal angles, where each of them equals a right angle.
A quadrilateral can only have either 2 right angles or four. As you may (or may not) know, the angles in a quadrilateral must add up to 360 degrees. If you have 3 right angles that adds up to 270 degrees, so the last side must also be 90 degrees.
square and a rectangle
Equal angles.