Answer:
PA = 6
Explanation:
given a tangent and a secant drawn from an external point to the circle , then the square of the tangent is equal to the product of the secant's external part and the entire secant , that is
PA² = PB × PC = 3 × (3 + 9) = 3 × 12 = 36 ( take square root of both sides )
PA =
= 6