A) What is the size of angle a? b) Use your answer to part a) to work out the size of reflex angle b. Give your answers to the nearest degree.

The angle $a$ starts from the $0^\circ$ mark on the left side of the protractor (inner scale). The other arm of the angle points to the mark between $70^\circ$ and $80^\circ$. This mark represents $75^\circ$.

The size of angle $a$ is $\boxed{\text{75 degrees}}$.

Angle $b$ is the reflex angle corresponding to angle $a$.

The size of reflex angle $b$ is $\boxed{\text{285 degrees}}$.