Question

Find the total surface area of a cylindrical tank of height 2.1m and diameter 0.7 m. Also find the cost of painting at the rate of $9.5 per sq metre.​

Answer 1

Answer:
$ 56.34
Explanation:
Total surface area of cylindrical tank:
height =h= 2.1m
diameter = 0.7m
radius = diameter ÷2
r = 0.7 ÷ 2 = 0.35 m
Substitute the values of r and h in the below mentioned formula and find the surface area of the tank.
Area of cylindrical tank = 2 π r ((r+ h)
= 2 * 3.14 * 0.35 (0..
= 2 * 3.14 * 0.35 * 2.45
= 5.39 square meter
To find the cost of painting the surface area of tank, multiply the cost of painting per square meter by the total surface area of tank.
Cost of painting = 5.93 * 9.50
= $ 56.34

Answer 2

$ 56.34

Explanation:

Total surface area of cylindrical tank:

height = h = 2. 1m

diameter = 0.7m

radius = diameter ÷2

r = 0.7 ÷ 2 = 0.35 m

Substitute the values of r and h in the below mentioned formula and find the surface area of the tank.

`\boxed{Area \ of \ cylindrical \ tank = 2\pi r((r + h)}`

= 2 * 3.14 * 0.35 (0.35 + 2.1)

= 2 * 3.14 * 0.35 * 2.45

= 5.39 square meter

To find the cost of painting the surface area of tank, multiply the cost of painting per square meter by the total surface area of tank.

Cost of painting = 5.93 * 9.50

= $ 56.34