What is the measure of a straight angle?

The measure of an acute angle $<{90}^{\mathrm{o}}$.

The measure of a reflex angle $>180°$.

The measure of one complete revolution $=360°$.

If $\mathrm{m}\mathrm{\angle }\mathrm{A}=53°$ and $\mathrm{m}\mathrm{\angle }\mathrm{B}=35°$, then $\mathrm{m}\mathrm{\angle }\mathrm{A}>\mathrm{m}\mathrm{\angle }\mathrm{B}$.