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Tangents OP and OQ are drawn from the origin 'O' to the circle x²+y²+2gx+2fy+c=0 with centre C. Prove that the area of the quadrilateral OPCQ is √[c(g²+f²-c)]

Tangents OP and OQ are drawn from the origin 'O' to the circle x²+y²+2gx+2fy+c=0 with centre C. Prove that the area of the quadrilateral OPCQ is 
√[c(g²+f²-c)]

Grade:11

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