Points P, R, and T lie on a straight line. The distance from P to R is 21, and the distance from P to T is 9. Column A

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问题 Points P, R, and T lie on a straight line. The distance from P to R is 21, and the distance from P to T is 9.

Column A                          Column B
The distance from R to T          16

选项 A、if the quantity in Column A is greater
B、if the quantity in Column B is greater
C、if the two quantity are equal
D、if the relationship cannot be determined from the information given

答案D

解析 点P、R和T位于同一条直线上,P到R的距离是21,P到T的距离是9。比较R到T的距离与16。
解:本题的正确答案为(D)。因为题目中并未给出P,R和T的相对位置,所以T有两可能的位置:①T在P和R的中间,此时RT=12;②T和R在P的两侧,此时RT=30。
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