Question

4.Find the area of sheet required to make closed cylindrical vessel of height 2m and diameter 70 cm.​

Answer 1

Solution:

We know that,

Diameter = 2 × radius

Let the radius and height of the cylinder be 'r' and 'h' respectively.

Height of the tank, h = 1 m

Radius of the tank, r = 140 cm / 2 = 70/100 m = 0.7 m

Total surface area of the closed cylindrical tank = 2 π r (r + h)

= 2 × 22/7 × 0.7 m × (0.7 m + 1 m)

= 4.4 m × 1.7 m

= 7.48 m²

7.48 m² of the sheet is required for making the cylindrical tank.

Answer 2

Step-by-step explanation:

given,

height=2m

diameter=70cm=70/100=0.7m

radius=0.7/2=0.35m

now,

.°. total surface area of cylinder=2πr(h+r)

=2*22/7*0.35(2+0.35)

=2.2+2.35

=4.55m²