Solution 1. An English capital letter ∠B∠c can represent two angles;

2. There are three corners with a vertex, ∠ bad, ∠ CAD, ∠ BAC;

3. There are seven angles of * * in the figure, ∠B, ∠C, ∠BAD, ∠CAD, ∠BAC, ∠ADB, ∠ADC (to ensure correctness and safety of Laojiu. )