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Pp= ah = d₁×d₂÷2
d₁= a√3÷2×2 = a√3
d₂=a
Pp= a×a√3÷2 = a²√2÷2
Pp= 2× 5√3÷2 + 4 × 5×5
Pp= 25√3 + 100 = 25 (√3+4) cm³