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