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P - Pole całkowite
R - promień podstawy stożka
H - wysokość stożka
l - tworząca stożka
l = 6dm
R = ½l = 3dm
H = l√3/2 = 6√3/2 = 3√3dm
V = ⅓ * π * R² * H
V = 1/3 * π * 3² * 3√3 = 9√3π dm³ ≈ 28,26√3 dm³
P = π * R * l + π * R²
P = π * 3 * 6 + π * 3²
P = 18π + 9π = 27π dm³ ≈84,78 dm²