# What is the difference between supplementary angles and a linear pair?

Linear pair is a pair of two supplementary angles. But two supplementary angles might or might not form a linear pair, they just have to "supplement" each other, that is their sum should be ${180}^{o}$.
Each pair form supplementary angles because their sum is ${180}^{o}$.
There might be two angles that sum up to ${180}^{o}$, but that do not form a linear pair. For example, two angles in a parallelogram that share a common side.