Question

How much sq metre of sheet is required to make 50 cylinders of 20 cm height and diameter of 14 cm ? If cost of 1 sq m cost of sheet is Rs.200 then how much will be expenditure ?

Answer 1

Answer:

Step-by-step explanation:

Height of the cylinder = 20 cm = 0.2 m (Given)

Diameter of the cylinder = 14 cm = 0.14 m(Given)

Thus, radius of cylinder = 0.14/2 = 0.7 cm

Surface area of the cylinder = 2πr² + 2πrh

Surface area = 2π (0.7)² + 2π (0.7) (0.20)

= 0.378π m²

Surface area of 1 cylinder : 0.378π cm²

Surface are of 50 cylinders = 0.378π x 50

= 18.9π

= 59.4

Thus, the surface area of 50 cylinders is 59.4 m²

Cost of 1 sq m = 200

Total expenditure = 200 × 59.4 = 11,880.