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L tabung (dengan tutup) = 2πr² + 2πrt = 2πr(r + t)
L tabung (tanpa tutup) = πr² + 2πrt = πr(r + 2t)
V tabung = πr²t
6. d = 35 cm
t = 28 cm
L = 5005 cm²
7. V = 785 dm³
r = 50 cm = 5 dm
785 = π x r² x t
t = 785/(3,14 x 5 x 5)
t = 10
L = 392,5 dm³ = 392500 cm³
8.L kerucut = πrs + πr2 = πr(r + s)
r = 12
t = 5
s = 13 (gunakan pythagoras)
L = 942 cm²
9.
L bola = 4πr²
d = 14 cm => r = 7
L = 616 cm²