If the length of the longest side of a triangle is 18 , which of the following could not be the length of its second-longest side?
A.
9
B.
10
C.
12
D.
17
Exam No：2018 First Round Grade 6 Year：2018 Question No：7
Answer:
A
Knowledge points:
G6 - Geometry - Perimeter (All Shapes)
Solution:
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