Question

Raghu had to make a cylindrical tube with an aluminium cover. What is the area of the aluminium sheet he needs to cover the tube if the tube has a length of 1 m and base radius 3.5 cm?
(Take π=22/7)

• A. $1100{cm}^2$
• B. $2200{cm}^2$
• C. $3300{cm}^2$
• D. $1500{cm}^2$

Answer 1

The correct option is B $2200{cm}^2$

$r=3.5cm,h=1m=100cm$

Area of Aluminium sheet required
= curved surface area of the tube

$=2\pi rh$

$=2\times \frac{22}{7}\times 3.5\times 100$

$=2200{cm}^2$