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1

IIT-JEE 1987

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The area of the triangle formed by the tangents from the point (4, 3) to the circle $${x^2} + {y^2} = 9$$ and the line joining their points of contact is...................

Answer

$${{192} \over {25}}$$
2

IIT-JEE 1986

Fill in the Blanks
The equation of the line passing through the points of intersection of the circles $$3{x^2} + 3{y^2} - 2x + 12y - 9 = 0$$ and $${x^2} + {y^2} - 6x + 2y - 15 = 0$$ is..............................

Answer

10x - 3y - 18 = 0
3

IIT-JEE 1986

Fill in the Blanks
From the point A(0, 3) on the circle $${x^2} + 4x + {(y - 3)^2} = 0$$, a chord AB is drawn and extended to a point M such that AM = 2AB. The equation of the locus of M is..........................

Answer

$${x^2} + {y^2} + 8x - 6y + 9 = 0$$
4

IIT-JEE 1985

Fill in the Blanks
From the origin chords are drawn to the circle $${(x - 1)^2} + {y^2} = 1$$. The equation of the locus of the mid-points of these chords is.............

Answer

$${x^2} + {y^2} - x = 0$$

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