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Luas permukaan = luas alas lingkaran + luas selimut tabung + luas 1/2 permukaan bola
Luas alas = πr² = 3,14 . 4² = 3,14 . 16 = 50,24 cm²
Luas selimut tabung = 2πrt = 2 . 3,14 . 4 . 18 = 452,16 cm²
Luas 1/2 permukaan bola = 1/2 . 4πr² = 1/2 . 4 . 3,14 . 4² = 100,48 cm²
Luas permukaan bangun = 50,24 + 452,16 + 100,48 = 602,88 cm²