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Bab Bangun RuangMatematika SMP Kelas VIII
Tabung tanpa tutup
luas sisi = π x r x (r + 2t)
= 3,14 x 10 x (10 + 2 x 5)
= 31,4 x (10 + 10)
= 31,4 x 20
= 628 cm²
= πr^2 + 2πrt
= 3,14 x 10 x 10 + 2 x 3,14 x 10 x 5
= 314 + 62,8 x 5
= 314 + 314 = 628 cm pangkat dua