Question

How many meters of cloth $5$ m wide will be required to make a conical tent, the radius of whose base is $7$ m and whose height is $25$ m? (Take $\pi =22/7$).

• A. $108$ m
• B. $110$ m
• C. $112$ m
• D. $115$ m

Answer 1

Answer: (B)

$110$ m

Given : $l=25$
curved surface $=\pi rl=\pi \times 7\times 25=550m^2$
$\therefore$ Length of the cloth $=\frac{550}{5}=110.$