Alka Tuli and Rajesh Hassija Solutions for Chapter: Lines and Angles, Exercise 4: MENTAL MATHS

If the supplement of an angle is $169°$, the angle will be

If $\angle 1$ and $\angle 2$ are complementary and the measure of $\angle 1$ is $38°$, the measure of $\angle 2$ is

An angle is equal to five time its complement. The measure of the angle is _____$°$

The sum of two vertically opposite angles is $176°$. The measure of each of the angles is _____$°$

In the Figure, $l\parallel m\parallel n$, $\angle QPS=40°$ and $\angle QRT=50°$. The measure of $\angle PQR$ is _____$°$
  
 

If, in Figure, points $A, O$ and $B$ are collinear, then the value of $\angle COD$ is _____$°$

There are two parallel roads in the city. A narrow lane joins these two roads. The sum of the angles on the same side of the lane is _____$°$

A railway line crosses a road at an angle of $35°$ as shown in figure. Find the values of $a, b$ and $c$.