# Math

A chord 30cm long is 20cm from the centre of a circle calculate the length of a chord which is 24cm from the centre.

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1. If you bisect the first chord with a radius, you will have a right triangle with sides 15 and 20. So, the hypotenuse (another radius) is 25.

Now, draw the second chord, and its triangle is 7-24-25, so the full chord is 14 cm long.

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