Question

Hollow circular cylinder of inner radius 15 cm and outer radius 16 cm is made of iron, if height of the cylinder is 63 cm. How much iron is required to construct hollow circular cylinder?

• A. 6248 cm3
• B. 6348 cm3
• C. 6138 cm3
• D. 6156 cm3

Answer 1

Answer:

C. 6138 cm3

Solution:

Given:

Inner radius, r = 15 cm

Outer radius, R = 16 cm

Height, h = 63 cm

Concept:

Volume of a hollow cylinder = π(R² - r²)h

Calculation:

We know that,

Volume of a hollow cylinder = π(R² - r²)h

⇒ (22/7) × [16² - 15²] × 63

⇒ (22/7) × 31 × 63

⇒ 6138 cm³ 

Hence, the iron required to construct a hollow circular cylinder is 6138 cm³.