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In a rectangle the diagonals divide it in to two congruent triangles . this shows that all the angles are equal which implies that sum of all angles is 360.which shows that all angles are of 90.
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ramanason ghusadetu
mind your work
A rectangle is DEFINED to be a four sided polygon with all angles congruent.

The angle sum of a polygon of "n" sides is . So for a quadrilateral, the angle sum is .

Since all the angles are equal, that means if "a" is one of the angles, then .

Therefore, the angles in a rectangle are all right angles.
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