As shown in the figure, we know that the side length of the square ABCD is 1, P is the midpoint of the side of CD, and the point q is on the line BC, when BQ = 1___ Triangle ADP is similar to triangle QCP

As shown in the figure, we know that the side length of the square ABCD is 1, P is the midpoint of the side of CD, and the point q is on the line BC, when BQ = 1___ Triangle ADP is similar to triangle QCP

When RT △ ADP ∽ RT ∽ QCP, there are adqc = DPCP, ∽ BQ = 0, when RT △ ADP ∽ RT ∽ PCQ, ADPC = dpqc, ∽ BQ = 34, so when BQ = 0 or 34, triangle ADP is similar to triangle QCP, so the answer is: 0 or 34