Answer:
Total surface area for 3 cylinder tank = 11.4296 × 3 = 34.2888 m²
Tin of paints to buy ≈ 7
Explanation:
Tim wants to cover 3 tanks completely with paints. A tin of paints covers 5 m².
Surface area of a cylinder = 2πr(r + h)
where
r = radius
h = height
Surface area of a cylinder = 2πr(r + h)
r = 1.4/2 = 0.7 m
h = 1.9 m
Surface area of a cylinder = 2 × π × 0.7( 0.7 + 1.9)
Surface area of a cylinder = π × 1.4 × (2.6)
Surface area of a cylinder = 3.64π
Surface area of a cylinder = 3.64 × 3.14
Surface area of a cylinder = 11.4296 m²
The surface area for 1 cylinder tank = 11.4296 m²
Total surface area for 3 cylinder tank = 11.4296 × 3 = 34.2888 m²
Since 1 tin of paints cover 5 m²
? number of tin of paints will cover 34. 2888 m²
tin of paints = 34.2888/5 = 6.85776
tin of paints = 6.85776
tin of paints to buy ≈ 7