A certain unsharpened cylindrical #2 pencil is 1/2 centimeters in diameter and 25 centimeters long. What is the pencil s volume?Group of answer choices
Question
A certain unsharpened cylindrical #2 pencil is 1/2 centimeters in diameter and 25 centimeters long. What is the pencil's volume?
Group of answer choices
Solution
To find the volume of a cylinder, we use the formula V = πr²h, where r is the radius and h is the height (or in this case, the length of the pencil).
Step 1: Convert the diameter to radius. The radius is half of the diameter, so the radius of the pencil is 1/2 / 2 = 1/4 cm.
Step 2: Substitute the radius and the height into the formula. The height is 25 cm, so the volume is V = π * (1/4)² * 25.
Step 3: Calculate the volume. (1/4)² = 1/16, so V = π * 1/16 * 25 = 25π/16 cubic cm.
So, the volume of the pencil is 25π/16 cubic cm.
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