Question

Using ruler and compasses, construct the following angles:
${180}^o$

Answer 1

Steps of Construction:
1. Construct a line segment $BC$.
2. Taking $B$ as centre and some suitable radius construct an arc which meets $BC$ at the point $P$.
3.Taking $P$ as centre and with same sadius cut off the arcs $PQ,QR$ and $RS.$
4. Now join $BS$ and produce it to point $A$.
$\angle ABC={180}^o$