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ABCD przekroj ∠A = 45º ∠D = 90º => ∠C = 45º => ABCD kwadrat
r promień podstawy, Pc całkowita powierzchnia (pole)
|AD| = |DC| = 2r; Pc = Pp + 2r*2πr = πr² + 4πr² = 5πr²
V = Pp*2r = 2πr³
54π = 2πr³; r³ = 27; r = ∛ 27 = 3; Pc = 5πr² = 5π3² = 45π
Pc = 45π