Geometry
posted by JUn .
A study draws triangle with a perimeter 36cm.the study says that the longest side measures 18cm. how do you know that the student is incorrect?

Perimeter = 36
36  18 longest side = 18
This would mean that the remaining TWO sides total 18.
The length of any side of a triangle will always be less than the sum of the lengths of the other two sides and greater than the difference of the lengths of the other two sides.
18 is not less than sum of the other two
sides.
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