Question 47 Answer and Explanation _ACT December 2010 Form 69A Math Section

47. The Worthwhile Company's logo consists of 2 concentric circles. The radius of the outer circle of the logo on Worthwhile's building is 4 feet, and the distance between the outer circle and the inner circle is 1.75 feet. Which of the following is an expression for the area, in square feet, of the inner circle of the logo on Worthwhile's building?

A. (4 - 1.75)²π

B. (4 - 1.75)π

C. (4²- 1.75²)π

D. 2(4 - 1.75)²π

E. 2(4 - 1.75)π

Answer and Explanation

Your Answer is

Correct Answer is A

Explanation

The radius of the inner circle is 4-1.75, so the area of the circle is (4-1.75)²π. Choose A.