# <span lang="EN-US

Let distance OC = 8 cm

Chord AB = 30 cm

Draw OCAB

Therefore,

OC bisects AB at C

AC = (1/2) AB

AC = (1/2) 30

AC = 15 cm

In triangle OCA,

OA2 = OC2 + AC2

OA2 = 82 + 152

OA2= 64 + 225

OA2= 289

OA = 17 cm

Hence, radius of the circle = 17 cm.

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