Drawing an angle of 68° with the help of protractor.
Bisecting :
With point B as center draw an are with compass which intersects the sides of angle B at P and Q, With P as center, keeping the same width of compass draw an are within the area of the angle. Similarly with Q as center and the width of compass as before, draw an arc intersecting the previous arc. Label the intersection as point D. Join D and B gives the bisector BD of angle B. ∠ABD and ∠DBC are equal.