NEIEP Mechanics Practice Exam

To determine the area of a plunger with a 6-inch diameter, you need to use the formula for the area of a circle, which is A = πr², where r is the radius.

First, find the radius by halving the diameter. The radius of a 6-inch diameter is 3 inches (6 inches ÷ 2).

Now, plug the radius into the area formula:

A = πr²

A = π(3 inches)²

A = π(9 square inches)

A ≈ 3.14 × 9

A ≈ 28.26 square inches.

Rounding this gives approximately 28.27 square inches. Therefore, the area of a 6-inch diameter plunger is approximately 28.27 square inches, making it the correct answer.