SAT Math Multiple Choice Practice Question 253: Answer and Explanation
11. In ΔABC, and . Which of the following could not be the length of AC?
Correct Answer: A
A In a triangle, any side must have a length that is less than the sum of the two other lengths but greater than the difference of the two other lengths. Therefore, the third side must have a length between 15 –9 = 6 and 15 + 9 = 24, so a length of 5 is impossible.