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OABC is a rhombus whose three vertices. ...

OABC is a rhombus whose three vertices. A, B and C lie on a circle with centre O.
(i) If the radiusof the circle is 10 cm, find the area of the rhombus.
(ii) If the area of the rhombus is `32sqrt(3)cm^(2)` find the radius of the circle.

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