Question
Construct the following angles with help of a protractor: $180^\circ $
✓
Answer
Draw a ray $OA$. Place the protractor in such a way that its centre lies exactly at $O$ and the base line lies along $OA$. Starting from $0^\circ $ on the side of $A$. Took for the $180^\circ $ mark on the protractor. Mark a point $B$ on this $180^\circ $ mark. Remove the protractor and draw the ray $OB.$ Then $\angle\text{AOB}$ is the required angle whose measure is $180^\circ .$
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