Find the coordinates of point B on AC such that AB is 2/3 of AC

What is the shape of the height and weight distribution

Which equation represents the model shown? a)1/3 divide 1/6 = 2 b)2/3 divide 1/6 = 2/18 c)1/3 divide 1/6 = 1/18 d)2/3 divide 1/6 =4

Does the point (1, sqrt 7) lie on circle shown.