81.
The gong shown below is 30 cm in diameter and hangs by a chain from a nail. The total length of
the chain is 18 cm. The lengths of chain on each side of the nail are equal to each other and form
a tangent to the gong.
Note : The diagram shown above has not been drawn to scale.
How far above the top of the gong is the nail, to the nearest tenth of a centimetre?
(1) 2.3 cm
2) 2.5 cm
(3) 12.0 cm
(4)17.5 cm
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