Come on! ! The Revised Solution of Mathematics "New Curriculum Reform Classroom Work" (Complete Works of Grade Nine)
As shown in figure 19- 137, in a square grid with a size of 4 times 4, the vertices a, b and c of triangle ABC are on the vertices of the unit square. Please draw a triangle A 1B 1C 1 in the picture, which is similar to triangle A 1B65438.