Learning Mathematics for IIT JEE
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Sunday, December 7, 2008
coordinates of the centres related to triangle
centroid ((x1+x2+x3)/3, (y1+y2+y3)/3)
In-centre
A(x1,y1)
B(x2,y2)
C(x3,y3)
Incentre ((ax1+bx2+cx3)/(a+b+c), (ay1+by2+cy3)/(a+b+c))
Ex centres
centre of the escribed circle opposite to the angle A
((-ax1+bx2+cx3)/(-a+b+c), (-ay1+by2+cy3)/(-a+b+c))
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