Question

Find the curved surface area of a cylindrical tank of base radius 30 cm and height 2m

Answer 1

`{\pink{\underline{\textsf{\textbf{Answer : }}}}}`

➡️ 37,680m² will be the curved surface area of the cylindrical tank.

`{\purple{\underline{\textsf{\textbf{Explanation : }}}}}`

Given that, A cylindrical tank of base radius is 30cm and it's height is 2m or, 200cm

We need to find the curved surface area

We know that,

➩ Curves surface area of a cylinder = 2πrh

r (radius) = 30cm.

h (height) = 200cm.

Therefore,

➩ Curves surface area of a cylinder:

➩ 2 × 3.14 × 30 × 200

➩ 2 × 18,840

➩ 37,680 m² ans.

Answer 2

37 700m² (rounded off to 3 s.f.)

Explanation:

When the curved surface area of a cylindrical tank is laid out, it will be like a rectangular piece of sheet with the circumference of the base circle as its length and the height as its breadth.

Circumference of base circle with radius 30cm = pi × 30 × 2

= 60pi

2m = 200cm

Curved surface are = 60pi × 200

= 12 000pi

= 37 700m² (rounded off to 3 s.f.)