rectangle
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The fact that corresponding angles are congruent does not require corresponding sides to be proportional - except in the case of a triangle. For quadrilaterals, think of a square and rectangle.
yes or no
Complimentary angles ARE NOT always congruent. However, if one angle is 45 degrees, then they would be congruent since the other would have to be 45 degrees to add up to 90 degrees.
opposite or vertical angles
A pair of congruent angles are those which measure the same size. Therefore, two congruent angles can be of any size, as long as they are of an identical size.Angles of 90 degrees are commonly referred to as "right angles".