SAT数学Problem Solving练习题(9)
- 2017年07月25日13:41 来源:互联网
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Question 9: Two of the sides of a triangle are 7 and 6. What of the following could be the perimeter of the triangle?
(a) 14
(b) 26
(c) 18
(d) 9
(e) 12
Answer: The angle between the two sides should be higher than 0 degrees and the third side should be higher than 7 - 6 = 1. The perimeter should be higher than 7 +6 +1 = 14
The angle between the two sides should be lower than 180 degrees and the third side should be lower than 7 + 6 = 13. The perimeter should be lower than 7 + 6 + 13 = 26
(c) is the only value between 14 and 26.