Healthy Ningbo ap

Answer: Solution: (1) Similar. The reason for this is the following：

Known from: AB=2, BC=32, AC= 10, AD=2, PD=3, AP = 5；;

So: ABAD=2, BCPD=2, kappa = 2; Namely: abad = bcpd = capa

So △ ABC ∽△ ADP

(2) As shown in the figure,

△ACD' is an isosceles right triangle;

Because AC=AD= 10, CD=25, CD2=AC2+AD2,

So △ACD' is an isosceles right triangle.

(3) Because △ACD' is an isosceles right triangle, ∠ ACD = ∠ OCA+∠ OCD = 45.