I'm assuming the center of dilation is the origin....if so....the coordinates of the vertices of the new triangle are (-1,2), (0,1) and (1, -2) ......here's a pic.....

I'm assuming the center of dilation is the origin....if so....the coordinates of the vertices of the new triangle are (-1,2), (0,1) and (1, -2) ......here's a pic.....