Diketahui volum suatu tabung 175Pi cm3 bila diameter tabung 10 cm maka luas sisi tabung adalah....cm2 A.120 Pi B.124 Pi C.144 Pi D.176 Pi
5dregensleyer
Volume = π x r² x t 175 π = π x 5 x 5 x t 175 = 25 x t 175/25 = t 7 = t luas permukaan Lp = 2La + Ka x t = ( 2 x π x r²) + ( 2 x π x r x t) = (2 x π x 5 x 5 ) + ( 2 x π x 5 x 7) = 50π + 70π = 120π
175 π = π x 5 x 5 x t
175 = 25 x t
175/25 = t
7 = t
luas permukaan
Lp = 2La + Ka x t
= ( 2 x π x r²) + ( 2 x π x r x t)
= (2 x π x 5 x 5 ) + ( 2 x π x 5 x 7)
= 50π + 70π
= 120π
jawabannya adalah A.120π