单选题Two circles, P and Q, lie in the same plane. If the center of circle Q lies on circle P, then in how many points could circle P and circle Q intersect?Ⅰ. 0Ⅱ. 1Ⅲ. 2AⅠ onlyBⅡ onlyCⅢ onlyDⅠ, Ⅱ and ⅢEⅡ and Ⅲ only
单选题
Two circles, P and Q, lie in the same plane. If the center of circle Q lies on circle P, then in how many points could circle P and circle Q intersect?Ⅰ. 0Ⅱ. 1Ⅲ. 2
A
Ⅰ only
B
Ⅱ only
C
Ⅲ only
D
Ⅰ, Ⅱ and Ⅲ
E
Ⅱ and Ⅲ only
参考解析
解析：
If the radius of circle Q is greater than the diameter of circle P, there is no intersection point. If the radius of circle Q is equal to the diameter of circle P, there is one intersection point. If the radius of circle Q is less than the diameter of circle P, there are two intersection points.
If the radius of circle Q is greater than the diameter of circle P, there is no intersection point. If the radius of circle Q is equal to the diameter of circle P, there is one intersection point. If the radius of circle Q is less than the diameter of circle P, there are two intersection points.
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