Question

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

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