Question

A cylindrical vessel open at the top has a diameter of 20cm and a height of 14cm. Find the cost of tin plating it on inside at the rate of Re1per 100 cm square

Answer 1

$2\pi \: rh$

2

Answer 2

Answer:

Rs.11.93805

Step-by-step explanation:

Diameter = 20 cm

Radius of cylinder = $\frac{Diameter}{2}=\frac{20}{2}=10cm$

Height of cylinder = 14 cm

Since we are given that the cylinder is open from the top.

So, total surface area = Curved surface area +Area of base

                                   = 2πrh+ πr^2

Where r is the radius and h is the height.

So, total surface area = 2π(10)(14)+ π(10)^2

                                   =1193.805

Cost of plating 100 sq. cm. = Rs.1

So, cost of plating 1 sq. m. =1/100

Cost of plating 1193.805 sq. m. =(1/100)*1193.805=11.93805

Hence the cost of tin plating it on inside at the rate of Re1 per 100 cm square is Rs.11.93805