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a) △EPF, △EFH, △FGH

b) ∠EPH = ∠PEH = 60° (equilateral triangle)
∠PEF = 60+90=150°
∠EPF = (180-150)/2 = 15° (sum of angles in isosceles △EPF)
∠FPH = 60-15 = 45°

c) ∠PHE = 60° (equilateral triangle)
∠EHF = (180-90)/2 = 45° (sum of angles in isosceles △EFH)
∠PHF = 60+45 = 105°

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