Question

Which pairs of following angles become complementary or supplementary angle.

Answer 1

Consider $\left(i\right),\left(ii\right)$

${30}^{\circ }+{60}^{\circ }={90}^{\circ }$

Hence $\left(i\right)$ and $\left(ii\right)$ are complementary angles.

Consider $\left(ii\right),\left(iii\right)$

${60}^{\circ }+{120}^{\circ }={180}^{\circ }$

Hence $\left(ii\right)$ and $\left(iii\right)$ are supplementary angles.