单选题
Let P and Q be points which are two inches apart, and let A be the area, in square inches, of a circle which passes through P and Q. Which of the following is the set of all possible values for A?
A. 0＜A B. 0＜A ≤π C. A=π
D. A＞π E. A ≥π
A. 0＜A B. 0＜A ≤π C. A=π
D. A＞π E. A ≥π
【正确答案】
E
【答案解析】If PQ is a diameter of the circle, then the radius is 1 and A, the area, is π. This is the smallest possible value of A, but A can be any number larger than π if the radius is made sufficiently large, as shown by the figures below.
