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Question

If the lines 2x3y=5 and 3x4y=7 are the diameters of a circle of area 154 square units, then obtain the equation of the circle.

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Solution

Area of given circle is it 154
πr2=154227r2=154r2=154×722r249r=7
The intersection point of 2x - 3y it 5 and 3x -4y = 7 is
The centre of the circle. Solving simultaneous equations
2x3y=5and3x4y=7
we get, Centre of circle as (1, -1)
Equation of circle with centre (1, -1) and radius = 7 is
(x1)2+(y+1)2=72x22x+1+y2+2y+1=49x22x+y2+2y=47


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