From a point A, a tangent line is drawn to a circle of radius 7 units. From the same point, a secant is drawn to the circle which cuts the circle at p...
Question
From a point A, a tangent line is drawn to a circle of radius 7 units. From the same point, a secant is drawn to the circle which cuts the circle at points B and C, with B closer to A than C. Given the length of the tangent from A to the circle is 21 units and the length of segment AB is 14 units, find the length of BC.