Please help! I will mark brainilest!

If the endpoints of the diameter of a circle are (8, 6) and (2,0), what is the standard form equation of the circle? a) (x + 5)2 + (y + 3)2 = 18 (x + 5)2 + (y + 3)2 = 3.72 (x - 5)2 + (y - 3)2 = 18 d) (x - 5)2 + (y - 3)2 = 32

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

3/4 = c/36 i need with this fraction proble.