Plz me i dont even know how to start this can u also explain how to do it much appretciated

Ok did your teacher say anything about not being able to use negative numbers or fractions? If not can you use fractions or negative numbers.

Hello, is the attached figure the same with yours? since ab is tangent to the circle and there are two points in the second line (point c and point d), the second line is assumed to be a secant.ab^2 = bc x bd16^2 = 4 x bd256 = 4 x bdbd = 64to get cd, deduct bc from bd.cd = bd - bccd = 64 - 4cd = 60