Question

to.
The internal radius of the pipe is 2.1 cm, the external radius is 2.5 cm, and the length of the pipe is
12 cm, find:
o
The volume of the steel used
Surface area of outer curved surface
(Take 2 = 3.14)​

Answer 1

Step-by-step explanation:

Inner radius of the pipe (r) = 2.1cm

Outer radius of the pipe (R) = 2.5cm

Height of the pipe (h) = 12cm

Here, Pipe → Hollow Cylinder

Volume of the pipe = π (R² - r²)h

→ V = 3.14 { (2.5)² - (2.1)²} × 12

→ V = 3.14 (6.25 - 4.41) × 12

→ V = 3.14 × 1.84 × 12

→ V = 69.33cm³

∴ Volume of steel used = 69.33cm³

Now, let us find the outer curved surface area of the pipe.

Outer curved surface area = 2πRh

= 2 × 3.14 × 2.5 × 12

= 6.28 × 30

= 188.4

∴ Outer curved surface area = 188.4cm²