ka tolong no 1-5 y!pakai cara!

2. a. luas alas tabung = pi × r × r = 3,14 × 5 × 5 = 78,5 cm^2
b. v tabung = pi × r × r × t = 3,14 × 5 × 5 × 12 = 942 cm^3

3.) v tabung = pi × r × r × t
3.140 = 3,14 × 10 × r^2
3.140 = 31,4 × r^2
r^2 = 3.140 / 31,4
r^2 = 100
r = akar (100)
r = 10 cm