Measure the Shaded Fraction

Q.

Assertion : If angles $a$ and $b$ form a linear pair of angles and $a=40°$, then $b={150}^{\circ }.$
Reason : Sum of linear pair of angles is always $180°$
Which of the following is correct.

1. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

2. If both Assertion and Reason are correct, Reason is not the correct explanation of Assertion.

3. If Assertion is correct but Reason is incorrect.

4. If Assertion is incorrect but Reason is correct.

Q.

Draw a circle and mark the fractional part $\frac{3}{8}$ by colouring it.

Q.

How many degrees are there in two right angles ?