Question

O is centre of the circle. Find the length of radius, if the chord of length 24 cm is at a distance of 9 cm

from the centre of the circle​

Answer 1

$AB = 2x \\ 24 = 2x \\ \boxed{x = 12}$

${OP}^{2}+{BP}^{2}={OB}^{2} \\ {9}^{2} + {12}^{2} = {OB}^{2} \\ {OB}^{2} = 225 \\ \boxed{OB = 15}$