Question

fins the length of the chord AB is ​

Answer 1

Answer:30cm(I can't explain it)

Answer 2

Answer:

$b { }^{2} = (oc) {}^{2} - (oa) {}^{2} \\ b {}^{2} =( 17) {}^{2} - (8) {}^{2} \\ b { }^{2} = 289 - 64 \\ b {}^{2} = 225 \\ b = \sqrt{225 } \\ b = 15 \: \: \: \: and \:$

$c \: is \: the \: mid \: point \: ac \: is \: = 15 \: then \: ab = 30$