O P Malhotra, S K Gupta and, Anubhuti Gangal Solutions for Chapter: Lines and Angles, Exercise 2: Revision Exercise

Angles forming a linear pair are supplementary.

If two angles are equal and complementary, then each angle is $45°.$

If two angles are equal and supplementary, then each angle is $90°$

A pair of vertical angles may also form a linear pair.

The sum of two acute angles can be $180°$.

In the below diagram, what is the measure of:

$\angle AOB$ and $\angle BOC$ are _____ angles. (Supplementary/Complementary/Linear pair of angles)

In the below diagram, $\angle AOB$ and $\angle BOE$ are _____ angles. [complementary / supplementary]

Find the value of $x$ in the below figure.