Tangent Secant Theorem
Point E is in the exterior of a circle. A secant through E intersects the circle at points A and B, and a tangent through E touches the circle at point T, then `EA xx EB = ET^(2)`.
Given `:` (1) A circle with centre O
(2) Tangent ET touches the circle at pointT
(3) Secant EAB intersects the circle at points A and B .
To prove `:` `EA xx EB = ET^(2)`