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In a triangle the sum of two sides is x and the product of the same two sides is y. If x 2 – c 2 = y, where c is the third side of the triangle, then the ratio of the in-radius to the circum-radius of the triangle is

) c x ( x 2 y 3 +
) c x ( c 2 y 3 +
) c x ( x 4 y 3 +
) c x ( c 4 y 3 +

Correct answer: ) c x ( c 2 y 3 +

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