How to construct an angle of 150 degee without using protractor ?

Construction steps:

1. Draw a line AB.

2. Take a point P on it.

3. Draw an arc from point P to cut AB at C and D.

4. Now, take CP as radius, draw two arcs from points C and D. Intersection of these two arcs gives an angle of 90°.

5. Draw an arc from point P on the left side of x - axis to cut it at point Q.

6. Now, take PM as radius, draw an arc from Point Q to cut the previous arc at a point E.

7. Join PE. ∠NPE = 60°

8. ∠EPB = ∠NPE + ∠BPN = 90° + 60° = 150°.