1. Diameter alas sebuah tabung 20 cm.Jika tinggi tabung 30 cm,berapa volumenya? 2. Tinggi sebuah tabung dua kali diameter alasnya.Jika jari-jari alasnya 7 cm,be

1. dik :
t = 30 cm
d = 20 cm
r = 20/2 = 10 cm

jawab :
v = πr²t
= 3,14 x 10 x 10 x 30
= 9420 cm³

2. dik :
r = 7
d = 7 x 2 = 14 cm
t = 2d = 2 x 14 = 28 cm

jawab :
v = πr²t
= 22/7 x 7 x 7 x 28
= 4312 cm³

3. dik :
t = 35 dm
r = 16 dm

jawab :
v = πr²t
= 22/7 x 16 x 16 x 35
= 28160 dm³

4. dik :
d = 20 dm
r = 20/2 = 10 dm
v = 4710 dm³

jawab :
v = πr²t
4710 = 3,14 x 10 x 10 x t
4710 = 314 x t
t = 4710/314
t = 15

5. dik :
v = 1848 dm³
t = 12 dm

jawab :
v = πr²t
1848 = 22/7 x r² x 12
1848 = 264/7 x r²
r² = 1848 x 7/264
r² = 49
r = √49
r = 7 dm