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What are the coordinates of the centroid of a triangle with vertices J(−4, 2) , K(2, 4) , and L(0, −2) ?

AngelRay  Nov 4, 2017

Best Answer 

 #1
avatar+92430 
+1

Find the midpoint of the side with  (2,4)  and ( -4,2) as vertexes  =

 

  (  [ 2 + -4 ] / 2,  [ 2 + 4 ] / 2 )  =  (-1, 3)

 

Find the point 2/3 of the distance from (0,-2) to (-1,3)  =

 

(0 + (-1 - 0) (2/3) , -2 + ( 3 - -2)(2/3)  )

 

( 0  - 2/3,  -2 + (5)(2/3)  )

 

(-2/3, -2 +10/3 )

 

(-2/3 , 4/3 )   and this is the centroid....

 

 

 

cool cool cool

CPhill  Nov 5, 2017
 #1
avatar+92430 
+1
Best Answer

Find the midpoint of the side with  (2,4)  and ( -4,2) as vertexes  =

 

  (  [ 2 + -4 ] / 2,  [ 2 + 4 ] / 2 )  =  (-1, 3)

 

Find the point 2/3 of the distance from (0,-2) to (-1,3)  =

 

(0 + (-1 - 0) (2/3) , -2 + ( 3 - -2)(2/3)  )

 

( 0  - 2/3,  -2 + (5)(2/3)  )

 

(-2/3, -2 +10/3 )

 

(-2/3 , 4/3 )   and this is the centroid....

 

 

 

cool cool cool

CPhill  Nov 5, 2017
 #2
avatar+92430 
+1

Here's a much easier method I had forgotten about....!!!

 

Centroid  =

 

(  Add the x coordinates of the vertices / 3, add the y coordinates of the vertices / 3  )

 

So we have

 

( [ -4 + 2 + 0] / 3 , [ 2 +  4 +  -2 ] / 3 )  \

 

[ -2/3,  4/3 ]

 

 

cool cool cool

CPhill  Nov 5, 2017

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