I need the answers, fast!

Brook states that the distance on the line is 4 units. caleb states that the whole line does not have a distance because it continues on forever. vivian states that the line is 6 units long. which distance did brook measure? which distance did vivian measure?

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.

Can someone explain to me how to do