AP is the tangent to the circle with centre O and radius 8 cm . If AB = 9 cm, then find the length of tangent AP.
8 cm
15 cm
The tangent at any point of a circle is perpendicular to the radius through the point of contact. ∴AP⊥OP
A cone of height 36 cm and base radius 9 cm is reshaped into a sphere. Find the radius of the sphere formed.