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π = 22/7
Ditanya : Lp.total = ... ?
Jawab : Lp total = Lp 1/2 bola + L.Alas lingkaran
L.1/2 bola = 2 π r²
= 2 × 22/7 × 7 × 7
= 44 × 7
= 308 cm²
L.Alas = πr²
= 22/7 × 7 × 7
= 154 cm²
Lp.total = 308 + 154
= 462 cm²
Jadi, Luas permukaan setengah bola tersebut adalah 462 cm²
LP 1/2 Bola = 4 π r² : 2
Penyelesaian
LP 1/2 Bola + L Lingkaran = 2 x x 7 x 7 + x 7 x 7
= 308 + 154
= 462 cm²