tolong kerjakan ya guys

13). d = 14 cm ==> r =7
t = 20
vtabung = phi.r^2.t
= 22/7 .7^2.20
= 3080 cm^3
14). L.alas = 114
v= 864
v= L.alas x tinggi
tinggi= v/ L.alas
= 864/114
= 7,5 cm
15). t= 5 dm
v= 6930 liter
= 6930 dm^3
phi.r^2 .t = 6930
22/7.r^2 .5 = 6930
22/7.r^2=6930/5
22/7.r^2 = 1386
r^2 = 441
r = 21