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Lp tabung = 3/2 LP bola = 3/2 x 120 cm² = 180 cm²
Cara panjang
Lp Bola = 4πr²
Lp Tabung = 2πr² + 2πrt (t = 2r)
Lp tabung =2πr² + 4πr² = 6πr²
Jika 4πr² = 120 cm² ---> πr² = 120/4 = 30 cm²
maka 6 πr² = 6 x 30 = 180 cm²
120 = 4π r²
r² = 120/4π
r tabung = r bola
t tabung = diameter bola = 2r
luas permukaan tabung
= 2 luas alas + luas selimut tabung
= 2π r² + πd . d
= 2π r² + π . 4r²
= 6π r²
= 6π . 120/4π
= 180 cm²