CD and EF are parallel to AB. They divide the area of PAB into three equal parts. If PE = 1, what is AC? I don't really know how to solve this. Is it similar triangles?

By similar triangles, AC = 1/3.

how did you find that? similar triangles? i have identified them but i'm not sure what to do next

Angle A = 90º

PA = AB

PE = 1

PC = √2

PA = √3

AC = √3 - √2