Help and can you explain how you got the answer???

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol

Cone a has a surface area of 384 ft2 and cone b has a surface area of 96 ft? . what is the ratio of their volume?

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?