Question

If the curved surface of a right circular cylinder is $1760c{m}^2$ and its radius is 21 cm, then its height is $\frac{80}{3}cm.$

• A. True
• B. False
• C. Data insufficient
• D. Ambiguous

Answer 1

The correct option is B False

Formula for curved surface of a cylinder $=2\pi rh$
given radius $=21cm$
$2\left(\pi \right)rh=1760$
$2\times \frac{22}{7}\times 21\times h=1760$
$2\times 22\times 3\times h=1760$
$h=\frac{1760}{44\times 3}$
$h=\frac{40}{3}cm$
Hence the given statement is false.