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Question -

If the equations of two diameters of a circle are 2x + y = 6 and 3x + 2y = 4 and the radius is 10, find the equation of the circle.



Answer -

It is given that thecircle has the radius 10 and has diameters 2x + y = 6 and 3x + 2y = 4.

We know that thecentre is the intersection point of the diameters.

On solving thediameters, we get the centre to be (8, -10).

We have a circle withcentre (8, -10) and having radius 10.

By using the formula,

We know that theequation of the circle with centre (p, q) and having radius ‘r’ is given by: (x– p)2 + (y – q)2 = r2

Where, p = 8, q = -10,r = 10

Now by substitutingthe values in the equation, we get

(x – 8)2 +(y – (-10))2 = 102

(x – 8)2 +(y + 10)2 = 100

x2 –16x + 64 + y2 + 20y + 100 = 100

x2 + y2 –16x + 20y + 64 = 0.

The equation of thecircle is x2 + y2 – 16x + 20y + 64 = 0.

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