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31-07-2019
Mathematics

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A student draws a triangle with a perimeter of 36cm. The student says the longest length is 18cm. How do you know the student is wrong?

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31-07-2019

The length of the first two sides of a triangle must be greater than the length of the last side. If the longest length were 18, the first two sides would be too short. 36-18=18, 18 is equal not greater than 18 which means the sum of the first two sides are too short.

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