Construction of Angles

If an angle of $60°$ is bisected twice, the angle so obtained measures _____$°$.

Make an angle which is equal to

Supplement of $75°$

Make an angle which is equal to

Complement of $60°$

Draw an angle of $120°$ and bisect it.

Draw an angle of $90°$ and find its line of symmetry using a ruler and a compass.

Draw an angle with vertex $O$. Take a point $A$ on one arm and $B$ on another arm such that $OA=OB$. Draw the perpendicular bisectors of $OA$ and $OB$. Let them meet at $P$. Is $PA=PB$?