which of the following could be the third side an acute triangle with the other two sides lengths of 5 and 10?
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An important rule to remember about triangles is called the third side rule:
The length of the third side of a triangle is less than the sum of the lengths of the other two sides and greater than the (positive) difference of the lengths of the other two sides.
For this triangle, the length of the third side must be greater than 9−7=297=2 and less than 9+7=169+7=16. All the answers are possible except for answer E, which is equal to 1616 but not less than 1616.
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