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#3c) Dik. Jari² = 4cm & Tinggi = 65cm
Dit. Luas selimut tabung (Lst) ?
Lst = 2πrt
Lst = 2 (3,14) (4) (65)
Lst = 6,28 (260)
Lst = 1632,8 cm²
d) Dik.Jari² tabung = 17mm & tinggi = 0,2m = 200mm
Dit. Luas selimut tabung (Lst) ?
Lst = 2πrt
Lst = 2 (3,14) (17) (200)
Lst = (6,28) (3400)
Lst = 21352 mm² atau 0,213 m²
#4
c) Dik. Jari² tabung =4,5 dm = 45 cm & tinggi = 9cm
Dit. Luas permukaan tabung Tanpa tutup (Lppt) ?
Lppt = πr (r + 2t)
Lppt = (3,14) (45) (45 + (2) (9))
Lppt = (141,3) (45 + 18)
Lppt = (141,3) (63)
Lppt = 8901,9 cm²
d) Dik. Diameter tabung = 7cm & tinggi = 7cm
Dit. Luas permukaan tabung tanpa tutup (Lppt) ?
Lppt = πr (r + 2t)
Lppt = 22/7 (7) (7 + (2) (7) )
Lppt = 22 (7 + 14)
Lppt = 22 (21)
Lppt = 462 cm²
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