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The diameter of a circle is a line which joins two points on the circle and also passes through the centre of the circle. (In the adjoining figure (Fig 11.12) AB is a diameter of the circle; C is its centre.)

Q. 4.     The diameter of a circle is a line which joins two points on the circle and also passes through the centre of the circle. (In the adjoining figure (Fig 11.12)AB  is a diameter of the circle; C is its centre.) Express the diameter of the circle (d) in terms of its radius (r).

                

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Length of diameter is double the length of the radius.

Thus,d = 2r

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