Question

Adjacent angles of a parallelogram are __________.

Answer 1

In parallelogram $\mathrm{ABCD}$ adjacent angles are $\angle \mathrm{A}\mathrm{and}\angle \mathrm{B},\angle \mathrm{B}\mathrm{and}\angle \mathrm{C},\angle \mathrm{C}\mathrm{and}\angle \mathrm{D},\angle \mathrm{A}\mathrm{and}\angle \mathrm{D}$.

The property of a parallelogram is that the adjacent angles are supplementary i.e. $180°$.

Hence, the adjacent angles of a parallelogram are supplementary.