You're talking about Euclidean geometry, right?
Geometry
Level
1
I've drawn a triangle on a piece of paper.
If its two side lengths are 3 and 4, which of the following can't possibly the remaining one?
5
6
7
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1 solution
For three sides of a triangle, the length of the longest side cannot be equal or more than the sum of the length of the 2 shorter sides.
3+4=7
Thus, 7 cannot be the length.