Tilt = diagonal line * ray

Because HB is perpendicular to the plane PAH

cosa Pb = cosb ph * cosa ph = cos 60 = 1/2

Because the angle APH=∠HPB

∴ COS ∠ APH 2 = 1/2 under the root sign.

∴∠APH=45

So AH=PH

Is it okay?