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Verify that the triangle formed by a chord and the centre of the circle is isosceles.
Proof:
Let \(EF\) be the chord and \(O\) be the centre of the circle.
Here, \(OE\) and \(OF\) are of the circle.
Thus, \(OE\) and \(OF\) are .
Hence, the triangle \(EOF\) has equal sides.
Therefore, the triangle formed by a chord and the centre of the circle is .
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