In a rectangular coordinate system, the set of all points (x, y) such that x2+y2<1 comprises

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问题 In a rectangular coordinate system, the set of all points (x, y) such that x2+y2<1 comprises

选项 A、a triangular region
B、two parallel line segments
C、a circular region
D、a rectangle region
E、a square region

答案C

解析 x2+y2=1刚好是以圆点为圆心,半径为1的圆的方程,x2+y2<1表示的是圆内所有点的集合,所以选择C。
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