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If all you have is the length of two sides of a triangle and nothing else, you can find the last side length by going through the Pythagorean Theorem. the formula for the Pythagorean theorem is a squared + b squared = c squared. say the two lengths of the triangle are 3 and 2. to find the hypotenuse, or missing length, you must plug in the numbers. the two missing sides, or legs, are going to be a and b. so your equation would now look like this: 3 squared + 2 squared = c squared. 3 squared = 9, and 2 squared = 4. 9 +4 = 13. so your equation is: 13= c squared. next you would find the square root of 13 (which you would need a calculator) and the answer would be about 3.6. that would be the last length for your triangle.

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Q: How do you determine the length of the third side of a triangle when you only have the lengths of two sides?
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