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V = ⁴/₃πr₃
P = 4πr²
P = ?
286 × 3,14 = ⁴/₃×3,14r³
898,04 = 4,18r³
⁸⁹⁸,⁰⁴/₄,₁₈ = r³
r³ = 214,84
r ≈ 6
P = 4 × 3,14 × 6²
P = 12,56 ×36
P = 452,16cm²