Answer to Question #1347 in Analytic Geometry for jun- jun villanueva
2011-01-15T04:27:48-05:00
Find the equation of the circle inscribed the triangle determind by the lines:2x-3y+21=0;3x-2y-6=0 and 2x+3y+9=0.
1
2011-01-17T02:31:11-0500
Firstly, we have to find the points of intersection of thelines: 1. 2x-3y+21=0 and 3x-2y-6=0 : (12, 15) 2. 2x-3y+21=0 and 2x+3y+9=0 : (-7.5, 2) 3. 3x-2y-6=0 and 2x+3y+9=0 : (0; -3). As the equation of the circle is R2 = (x-a)2 + (y-b)2 , we have the final system of equations for a and b: (12-a)2 + (15-b)2 = (-7.5-a)2 + (2 – b)2 (12-a)2 + (15-b)2 =a2 + (-3-b)2 144 + 225 – 24a -30b = 56.25 + 4 + 15a – 4b; 144+ 225 – 24a -30b = 9 – 6b. 308.75 = 39a + 26b; 360 = 24a +24b. (-6.25, 21.25) Thus R2 = (12+ 6.25)2 + (15-21.25)2 = 372.125Answer: (x+6.25)2 + (y-21.25)2 =372.125
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