diketahui drum minyak mampu menampung maksimum 770 liter jika tinggi drum 2 m maka diameter drum itu adalah….dm

V = phi x r2 x t
770 dm3 = 22/7 × r2 × 20 dm
770 x 7 = 22 × 20 × r2
5390 = 440 r2
r2 = 5390 : 440
r2 = 12.25
r = 3.5
diameter = 2r
= 2 x 3.5
= 7 cm