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It depends on the angle between the two lines. You can make the third side approach zero length or approach an infinite length. Take two pencils and hold them together at the ends to make a "V" out of them. Open the V up a bit and then close it up a bit. See how it works? You can vary the angle between the two line segments, and this will vary the length of the length of the third segment.

Q: What is the length of the third side of a triangle who's 2 sides are 7.1 and 6.8?

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The length of the third side of an equilateral triangle is the same as the lengths of both of the other two sides.

A triangle has two sides of lengths 7 and 9. what value could the length of the third side be?

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The sum of the two shorter sides of a triangle must be longer than the third. Thus the third side can be any length greater than 0 and less than 20. Examples are 0.5, 2, 5, 10, 15, 17.5, 19.9.

The sum of the 2 smallest sides of a triangle must be greater than the length of its longest side

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no it can not be eaual but it can be greater than The sum of the lengths of any two sides of a triangle is greater than the length of the third side.

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A triangle has two sides of lengths 7 and 9. what value could the length of the third side be?