Question

the distance of a chord of length 16 centimetre from the centre of the circle of diameter 20 centimetres​

Answer 1

from figure by Pythagoras theorem,

the distance of chord from the centre of the circle is,

$\sqrt{10 { }^{2} - 8 {}^{2} } = distance \: of \: chord \: from \: \: centre$

$= \sqrt{100 - 64}$