NCERT Solutions for Chapter: Lines and Angles, Exercise 1: Exercise

The figure below shows an equilateral triangle bounded by two straight lines.

What is the sum of four marked angles?

Prove that the diagonals of a rhombus are perpendicular to each other.

In the given figure, $AB\parallel CD$. Find the value of $x$.

$[$Hint: Through M draw $MF\parallel AB\parallel CD]$

Prove that $AB\parallel EF$

If an angle is such that six times its complement is $12°$ less than twice its supplement, then the value of angle is

In the given figure, $AOB$ is a straight line and $x : y : z=4 : 5 : 6$. Find the value of $y$.

In the given figure, determine $x$.

In the given figure, if $AOB$ is a straight line, then the value of $\angle BOC$?