Tolong dibantu .. penting sebuah tabung prisma jari jari alasnya adalah 7 cm. jika volume tabung tersebut 3.080 cm. maka luas selimut tabung adalah .. a. 550 cm b. 640 cm c. 880 cm d. 960 cm
khoirunnisa580
V = phi . r2 . t 3080 = 22/7 . 7 . 7 . t 3080 =22 . 7 .t t = 3080 : 154 t = 20 cm Ls = 2 . phi . r . t 2 . 22/7 . 7 . 20 2 . 22 . 20 = 880 cm (c.)
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cynthia3
Volume tabung = πr²t 3080cm³ = 22/7 × 7² × t 3080cm ³ = 154 × t t = 3080 ÷ 154 t = 20 cm Luas selimut = 2 πrt = 2 × 22/7 × 7 × 20 = 880cm
3080 = 22/7 . 7 . 7 . t
3080 =22 . 7 .t
t = 3080 : 154
t = 20 cm
Ls = 2 . phi . r . t
2 . 22/7 . 7 . 20
2 . 22 . 20
= 880 cm (c.)
3080cm³ = 22/7 × 7² × t
3080cm ³ = 154 × t
t = 3080 ÷ 154
t = 20 cm
Luas selimut = 2 πrt
= 2 × 22/7 × 7 × 20
= 880cm