Question

Construct the 120° angle, using ruler and a pair of compass only.

Answer 1

Steps of construction:

To construct an angle of 120°.

1. With centre O on the line OA, draw an arc to cut this line at C.
2. With C as a centre, drawn the same size arc which cuts the first arc at point D.
3. With D as a centre, draw one more arc of same size which cuts the first arc at E.
4. Join OE and produce it upto point B. Then, ∠AOB = 120°.