Posted by james on Thursday, December 19, 2013 at 8:51am.
A triangle has vertices with coordinates (2, 0), (3, 1), and (2, 5). If the triangle is dilated by a scale factor of 3 with the origin as the center of dilation, what are the coordinates of the vertices of the image.

math  Reiny, Thursday, December 19, 2013 at 11:34am
If the scale factor is 3, then
A(2,0) > A' (6,0)
B(3,1) > B' (9,3)
C(2,5) > C' (6,15)
Can't get any simpler than that.
Might be a good idea to graph the original triangle and the new triangle.
What do you notice ? 
math  todd, Thursday, February 11, 2016 at 12:58am
The vertices of triangle ABC are A(3, 6), B(6,3), C(9,3). Find the image matrix that represents the dilation of triangle ABC centered at the origin with a scale factor of 2/3. Then graph the triangle and its image