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Answer:

you can't!

Explanation:

triangle Perimeter = the sum of 3 sides of triangle.

to find the length of three sides you need to know the length of two sides

and the angle between these two sides.

For farther Information about triangle and how to measure triangle sides, see the link below:

http:/enzperiodzwikipediazperiodzorg/wiki/Triangle#Computing_the_sides_and_angles

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Q: How do you find the perimeter of a triangle if one side is equals x?
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