What is Tangent Secant theorem ?

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Solution

"When a tangent and a secant are drawn from one single external point to a circle, square of the length of tangent segment must be equal to the product of lengths of whole secant segment and the exterior portion of secant segment."

$P S^{2} = P R \times P Q$
or
$(T a n g e n t)^{2} = W h o l e S e c a n t \times e x t e r n a l s e c a n t$

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If a secant is drawn to a circle, then under any circumstance, tangents cannot be drawn parallel to the secant.

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