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Which side lengths would NOT make a triangle?

Which side lengths would NOT make a triangle?-example-1

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The sum of the lengths of any two sides of a triangle must be greater than the length of the third side. Since, 11 + 21 > 16, 11 + 16 > 21, and 16 + 21 > 11, you can form a triangle with side lengths 11 mm, 21 mm, and 16 mm.
User Manish Nakar
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