Monday, August 1, 2011

A triangle has vertices at A(-3, 2), B(-5, -6), and C(5, 0). Determine the equation of the median from vertex A how do you find...

The  vertices of the triangle are A(-3, 2), B(-5, -6), and
C(5, 0).


To find the median from A, to the other side BC,
we have to find the mid point M of BC and then find the equation of the line through A
and M.


M(x , y) = ( (xB+xC)/2 ,
(yB+yC)/2)


xM = (-5+5)/2 =
0


xM = (-6 +0)/2 = -3.


M(x ,y)
=(0,-3)


Now we find the equation of the median AM, with
A(-3,2) and M(0,-3).


We know that the line joining the
points (x1 , y1) and (x2,y2) is:


y-y1 =
{(y2-y1(/(x2-x1)}(x-x1).


Therefore the equation of AM
is:-


y- -2) = {(-3-2)/(0 - 3)}(x-
-3)


y+2 =( 5/3 )(x+3)


3(y+2) =
5(x+2)


3y+6 =5x+10


5x-3y+10-6
=0


5x-3y+4 = 0


Therefore the
equation of the median is 5x-3y+4 = 0 is the equation of the median through the vertex A
of the triangle.

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