d = 18 cm
r = d/2
r = 18/2
r = 9 cm
t = 22 cm
- Luas permukaan tanpa tutup
= π x r (r + 2t)
= 3,14 x 9(9 + 2(22))
= 3,14 x 9(9 + 44)
= 3,14 x 9 x 53
= 1.497,78 cm²
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d = 18 cm
r = d/2
r = 18/2
r = 9 cm
t = 22 cm
- Luas permukaan tanpa tutup
= π x r (r + 2t)
= 3,14 x 9(9 + 2(22))
= 3,14 x 9(9 + 44)
= 3,14 x 9 x 53
= 1.497,78 cm²