Because ∠BFE+∠BEF=90

And ∠AFH=∠EFH

∠FEG=∠CEG

So ∠AFE+∠CEF=2× 180-90.

∠EFH+∠FEG=270/2

= 135

In the triangular EFP

∠EPF= 180- 135

=45