A certain unsharpened cylindrical pencil is 0.635 cm in diameter and 25.4 cm long.What is the pencil's surface area?
A)12.9 cm2
B)25.8 cm2
C)38.7 cm2
D)51.6 cm2

Question

Quizplus · Accepted Answer

The surface area of a cylinder can be found by the formula: 
SA = 2πrh + 2πr^2
where r is the radius and h is the height (or length in this case) of the cylinder.

First, we need to find the radius of the pencil. Diameter = 0.635 cm, so radius = 0.3175 cm.

Next, we can plug in the values:
SA = 2π(0.3175)(25.4) + 2π(0.3175)^2
SA = 51.62375 cm^2
Rounding off to one decimal place, we get 51.6 cm^2.

Therefore, the best choice is D, 51.6 cm2.

A Certain Unsharpened Cylindrical Pencil Is 0