Are Linear Pairs Congruent?

Linear pairs are congruent. Adjacent angles share a vertex.

Why are linear pairs congruent?

A linear pair forms a straight angle which contains 180º, so you have 2 angles whose measures add to 180, which means they are supplementary. If two congruent angles form a linear pair, the angles are right angles. If two congruent angles add to 180º, each angle contains 90º, forming right angles.

Are linear pairs always congruent or supplementary?

Linear pairs are two angles that sit next to each other on a line. They're formed whenever two lines (or segments, or rays...) intersect. Linear pairs are always supplementary, since by definition their measures add up to a straight line.