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It can have any length less than 18 cm.

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Q: What is the length of third line on triangle when the other 2 lines are 9 cm?
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What is the length of the third side of an equilateral triangle have?

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


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It depends on what other information you have. Knowing the lengths of two sides of a triangle is not enough to calculate the third. You need to have some further information: and angle, the area, the length of an altitude or a median.