Question

The surface area of a solid cylinder of radius $2.0\, cm$ and height $10.0\, cm$ is equal to

• A. $1.2 \times 10^{2} mm ^{2}$
• B. $1.2 \times 10^{3} mm ^{2}$
• C. $1.2 \times 10^{4} mm ^{2}$
• D. $1.2 \times 10^{6} mm ^{2}$

Answer 1

Answer: (C)

Surface area of a cylinder $=2 \pi r h$
$=2 \times 3.14 \times 2 cm \times 10 cm$
$=125.6 cm ^{2}=125.6 \times(10 mm )^{2}=1.2 \times 10^{4} mm ^{2}$