Two circles of radi 15cm and 3cm intersect at two points and the distance
between their centre is 4cm. Find the length of the common chord.
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Let the radius of the two circles be 5 cm and 3 cm respectively whose centre's are O and O'. ➧ OO' is the perpendicular bisector of chord AB. ➧ Hence, the common chord will pass through the centre of the smaller circle, O' and hence, it will be the diameter of the smaller circle.
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