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3 August, 09:59

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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  1. 3 August, 10:21
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    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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