Question

The inner radius of a cylindrical wooden furniture is $8$ m and its outer radius is $12$ m. The height of the furniture is $35$ m. Find its lateral surface area. (Use $\pi =22/7$).

• A. $880m^3$
• B. $880m^2$
• C. $88m^2$
• D. $880{mm}^2$

Answer 1

The correct option is B $880m^2$

Given: Inner radius of the cylindrical furniture (r) $=8$ m

Outer radius of the cylindrical furniture (R)$=12$ m

Height of the furniture (h) $=35$m

$\therefore$ Lateral Surface area $=2\pi (R-r)h$

$=2\times \frac{22}{7}\times (12-8)\times 35$

$=2\times 22\times 4\times 5$

$=880m^2$