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L tabung = 2πr (r+t)
180 = 2 π r (r + 2r)
180 = 2 π r (3r)
180 = 6 π r²
πr² = 180/6
π r² = 30
L bola = 4 π r²
= 4 × 30
= 120 cm²
cara cepat menggunakan perbandingan
L tabung : L bola = 3 : 2
L bola = 2/3 × 180 cm²
= 120 cm²