Question

Calculate the surface area of a cylinder using the formula and using 3.14

Answer 1

Given that the formula to get the surface area of a cylinder is:

$SA=2\pi r^2+2\pi rh$

Method: Substitute the values of r and h into the equation

For Question A

r=radius=2m

h=height= 6m

$SA=2\times3.14\times2^2+2\times3.14\times2\times6=100.48m^2$

For option A, the surface area = 100.48 square meters

For Question B

r=4cm

h=11 cm

$SA=2\times3.14\times4^2+2\times3.14\times4\times11=376.8\operatorname{cm}^2$

For option B, the surface area = 376.8 square centimeters

For Question C

r=12mm

h=3mm

$SA=2\times3.14\times12^2+2\times3.14\times3\times12=1130.4\operatorname{mm}^2$

For Option C, the surface area= 1130.4 square millimeters