Question

Construct with ruler and compasses, angle of the following measure:
${120}^o$

Answer 1

Step 1: A ray from $O$ is drawn.

Step 2: Construct an arc from $O$ and with the same measurement construct $2$ arcs from the previous arcs.

Step 3: Join $OA$

$\therefore \angle AOX={120}^{\circ }$

Thus,$\angle AOX$ is the required angle making ${120}^{\circ }$