Jika Keliling Pada Alas Tabung Adalah 44 cm dan luas permukaan tabung adalah 1.496 cm², berapakah tinggi tabung? jika jari-jari tabung = 2kali tinggi tabung, carilah luas permukaan tabung!
Asruul
Ka = 44 2πr = 44 7/22 r = 22 r = 22 x 7/22 r = 7
Lp = 2πr (r+ t) 1496 = 2 . 22/7 . 7 (7 + t) 748 = 22 (7 + t) 7 + t = 748/22 7 + t = 34 t = 34 - 7 t = 27
2πr = 44
7/22 r = 22
r = 22 x 7/22
r = 7
Lp = 2πr (r+ t)
1496 = 2 . 22/7 . 7 (7 + t)
748 = 22 (7 + t)
7 + t = 748/22
7 + t = 34
t = 34 - 7
t = 27
=====
r = 2t
r = 2(27)
r = 54
Lp = 2πr (r + t)
Lp = 2 . 3.14 . 54 (54 + 27)
Lp = 339.12 (81)
Lp = 27.468,72 cm²