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Pp - pole podstawy = a²√3/4 = 9²√3/4 = 81√3/4 cm²
Pb - pole powierzchni bocznej = 3 * 81 cm² = 243 cm²
Pc - pole powierzchni całkowitej = 2 * Pp + Pb = 2 * 81√3/4 + 243 =
= 162√3/4 + 243 = 81√3/2 + 243 = 40,5√3 + 243 = 40,5(√3 + 6) cm²