diket tinggi tabung 14 cm dan luas selimut tabung 616 cm² hitunglah luas sisi tabung tsb jika phi 22_7

luas selimut = 2 x π x r x t = 616
2 x 22/7 x r x 14 = 616
r = 616 / (2 x 22 x 2)
r = 7 cm

luas sisi
= 2 x π x r x (r + t)
= 2 x 22/7 x 7 x (7 + 14)
= 44 x 21
= 924 cm²

Luas selimut tabung = 2x phi x r xt
616 = 2 x 22/7 x r x 14
616 = 88 x r
r = 6161/88
r = 7 cm

Luas sisi tabung = luas selimut + 2 x phi x r^2
= 616 + 2x 22/7 x 7 x7
= 616 + 308
= 924 cm2