Question

what do you know about --- and <--->.
BO AB

Be specific.

Answer 1

@Directrix

Answer 2

If O is the center of the circle, then segment BO is a radius. If line AB is a tangent to a circle, then B is the point of tangency.

That is the setup for a radius of a circle drawn to a tangent of a circle at the point of tangency. There's a theorem that gives that relationship.

Do you remember what that relationship is?

Answer 3

perpendicular

Answer 4

Yes, segment BO is perpendicular to line AB.