In Fig. 10.59, AB is a cord of length 16 cm of a circle of radius 10 cm. The tangents at A and B intersect at a point P. Find the length of PA.

Question

Philoid · Accepted Answer

_{OA=10 cm}

_{Perpendicular from centre to the chord bisects the chord.}

_{So AM=MB=8cm}

_{Using Pythagoras theorem in triangle AOM}