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A circle has an area of 64π in2. Which of the following is the circumference of the circle in terms of pi ( π)?

A. 9 π in

B. 16 π in

C. 4 π in

D. 8 π in

Answer Explanation:

 we need determine the radius of the circle before we can find the circumference of the circle from the given area.

Let r be the radius of the circle, then

Substituting the value of area

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

Now, the radius of the circle is 8 in. and the circumference of the circle is given by the relation:

Therefore, the Correct Answer is B.

More Questions on TEAS 7 Math

  • Q #1: A circle has an area of 64π in2. Which of the following is the circumference of the circle in terms of pi ( π)?

    A. 9 π in

    B. 16 π in

    C. 4 π in

    D. 8 π in

    Answer Explanation

     we need determine the radius of the circle before we can find the circumference of the circle from the given area.

    Let r be the radius of the circle, then

    Substituting the value of area

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

    Now, the radius of the circle is 8 in. and the circumference of the circle is given by the relation:

  • Q #2: Which of the following is the equivalence in pounds for 50 kg? (2.2 lb=1 kg)

    A. 52.2 lb

    B. 22.7 lb

    C. 110 lb

    D. 220 lb

    Answer Explanation

     We are asked to convert kg to pounds using the given relation. Letting x to represent the lb we are looking for.

    Nest, we set the proportion with kg in the numerator and lb on the denominator as follows.

    We find the value of x by cross-multiplication

    The value of x is 110 lb.

  • Q #3: Which of the following is the independent variable in the equation below? F(z)=9z+28

    A. F

    B. 9

    C. 28

    D. z

    Answer Explanation

    Given the equation F(z)=9z+28

    To find the value of F(z), we need to vary the value of z. In this case, z is the independent variable while F(z) is what we measure, which is the dependent variable.