Dr Pooranmal and Ashfaq A Khan Solutions for Chapter: Lines and Angles, Exercise 1: EXERCISE 13.1

Find the supplement of the angle $55°$.

Find the supplement of the angle $150°$.

Find the supplement of the angle $75°$.

Find the angle which is equal to its supplement.

In the given figure, $\mathrm{AOB}$ is a straight line and the ray $\mathrm{OC}$ stands on it. If $\angle \mathrm{AOC}=50°$ and $\angle \mathrm{BOC}=x°$. Find the value of $x$.

In the given figure, $\mathrm{AOB}$ is a straight line and the ray $\mathrm{OC}$ stands on it. If $\angle \mathrm{AOC}=\left(2x-10\right)°$ and $\angle \mathrm{BOC}=\left(4x+10\right)°$ find the value of $x$. Also, find $\angle \mathrm{AOC} \text{and} \angle \mathrm{BOC}$. 

In the given figure, $\mathrm{AOB}$ is a straight line and the rays $\mathrm{OC}$ and $\mathrm{OD}$ stands on it. If $\angle \mathrm{AOC}=60°,\angle \mathrm{BOD}=85°$ and $\angle \mathrm{COD}=x°$, find the value of $x$. 

In the given figure, rays $\mathrm{OA},\mathrm{OB},\mathrm{OC} \text{and} \mathrm{OD}$ are such that $\angle \mathrm{AOB}=56°,\angle \mathrm{BOC}=100°,\angle \mathrm{COD}=x°,\angle \mathrm{DOA}=74°$. Find the value of $x$.