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A circle has an area of 144 in2. Which of the following is the circumference of the circle in terms of pi ( )?

A. \(18 \pi in\)

B. \(6 \pi in\)

C. \(12 \pi in\)

D. \(24 \pi in\)

Answer Explanation:

We need to find the circumference of the circle.

Before finding the circumference of a circle, we need to find the radius of the circle from the given area.

Let r be the radius of the circle, then the area of the circle is:

Substituting the value of area in the above equation

Dividing both sides by pi and taking square root on both sides yields

The radius of the circle with the given area is 12 in, and the circumference of the circle becomes:

Therefore, the Correct Answer is D.

Q #1: Which of the following is the independent variable in the equation below? y(x)=7+8x

A. y

B. 7

C. x

D. 8

Answer Explanation
Q #2: Which of the following is the appropriate unit of a measure to express the weight of a pen?

A. Liter

B. Milliliter

C. Gram

D. Kilogram

Answer Explanation

Although we can measure the mass of the pen in kilogram, the unit is quite large and is not appropriate for measuring small objects. Liter and milliliter are units of measuring volume. Thus, gram is the appropriate unit for measuring weight of a pen.
Q #3: To determine the cost of producing the phone, the manufacturing company considers the location of raw materials, tax percent, and the price of chips. Which of the following is the dependent variable?

A. Price of chips

B. Cost of the phone

C. Raw materials

D. Tax percent

Answer Explanation

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