1. The problem states that angle $\angle A$ is less than angle $\angle B$, i.e., $\angle A < \angle B$. 2. To compare angles, we need the measures of $\angle A$ and $\angle B$. 3. Since the values of $\angle A$ and $\angle B$ are not provided, we cannot calculate or compare their exact measures. 4. If you provide the values of $\angle A$ and $\angle B$, I can help verify the inequality $\angle A < \angle B$ or solve related problems. 5. Please enter the measures of $\angle A$ and $\angle B$ to proceed.