Jika diketahui luas permukaan tabung 748 cm² dengan tinggi tabung 10 cm. volume tabung adalah . . . . . cm³. A. 119 B. 154 C. 308 D. 1040 E. 1540
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
Verified answer
Penjelasan dengan langkah-langkah:
lp = 748 cm²
t = 10 cm
lp = 2 x π x r(r + t)
748 = 2 x 22/7 x r(r + 10)
748 x 7 = 44r(r + 10)
5.236 = 44r² + 440
44r² + 440r - 5.236 = 0
44(r² + 10r - 119) = 0
r² + 10r - 119 = 0
(r + 17)(r - 7) = 0
r = -17 atau r = 7
ambil r = 7
• volume
= π x r² x t
= 22/7 x 7 x 7 x 10
= 1.540 cm³