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Well, there are 3 sides, and if you are given the length of 2 of the 3 sides, you can calculate the other one. The longest side of the triangle is called the "Hypotenuse" and to calculate the hypotenuse you take the lengths of the other sides, square each of them, then add. Take the square root of the answer and that is the length of the hypotenuse. Now if you have the length of the hypotenuse and either of the other two sides, take the length of the hypotenuse and the length of the other known side, square each of them, add them, then the square root of the sum will equal the remaining side.

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Q: How do you calculate the length of a side of a triangles?
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