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Two concentric circles have radii $4$ cm and $5$ cm. XY is a chord of the outer circle which touches the inner circle. Find the length of XY.
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In $\triangle OMY$,
$MY = \sqrt{5^2 – 4^2} = 3$ cm
$\therefore XY = 2 \times 3 = 6$ cm
In $\triangle OMY$,
$MY = \sqrt{5^2 – 4^2} = 3$ cm
$\therefore XY = 2 \times 3 = 6$ cm