Vertex a (- 2,2), B (- 1,4), C (4,5 +) of ladder ABCD, and AB / / DC, ab = 1 / 2dc, find the coordinates of vertex D Correction, C (4,5)

Vertex a (- 2,2), B (- 1,4), C (4,5 +) of ladder ABCD, and AB / / DC, ab = 1 / 2dc, find the coordinates of vertex D Correction, C (4,5)

Let D (x, y)
AB=(1,2)
DC=(4-x,5-y)
Because AB / / DC, ab = 1 / 2dc
So 4-x = 1 × 2 = 2
5-y=2×2=4
The solution is x = 2, y = 1
So the coordinates of point d (2,1)