Find the 13

Find the equation of the circle inscribed in the rhombus ABCD where A[1, -2], B[8, -3] and C[9, 4].

Result

e = (Correct answer is: ) OK

Solution:

A[1,2];B[8,3];C[9,4]. S=AC/2 x0=(91)/2=4 y0=(4(2))/2=3  AB: a=1   a 1+b (2)+c=0 a 8+b (3)+c=0 1 1+b (2)+c=0 1 8+b (3)+c=0  2bc=1 3bc=8  b=7 c=13   v=a2+b2=12+725 27.0711  r=a x0+b y0+cv=1 4+7 3+137.07115.374  R=r2=5.3742=72225=28.88  e:(xx0)2+(yy0)2=r2 e:(x4)2+(y3)2=28.88



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For Basic calculations in analytic geometry is helpful line slope calculator. From coordinates of two points in the plane it calculate slope, normal and parametric line equation(s), slope, directional angle, direction vector, the length of segment, intersections the coordinate axes etc.
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