Since there is no angle restriction in this case,
therefore the one rule that is applicable to this is that in forming a
triangle, the sum of the lengths of the two smaller sides (A + B) should be larger
than the length of the biggest side (C):
Triangle length rule: Side A + Side B > Side C
We can see that no matter how we combine the rods, the
only combination of rods that satisfies this rule is:
Triangle formed by
rods 3 meters, 5 meters, and 7 meters
Therefore, there is only 1 triangle that can be formed
from these four rods.
