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प्रश्न
The diameter of a circle is a line which joins two points on the circle and also passed through the centre of the circle. (In the adjoining figure AB is a diameter of the circle; C is its centre.) Express the diameter of the circle (d) in terms of its radius (r).
उत्तर
Diameter = AB = AC + CB = r + r = 2r
d = 2r
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