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pythagorean therom add them both together and subtract from 180

vv LAW OF COSINE vv

a^2 = b^2 + c^2 - 2(b)(c)CosA

Other Answer

1) If you have a perimeter you can subtract the first two from the total perimeter.

2) If it is a right triangle and you are missing the hypotenuse (the slanted one), the formula a^2 + b^2 = c^2 is used. (Words-- A squared plus B squared equals C squared.)

(A) is the length that is upright, (B) is the length that is sideways, and (C) is the hypotenuse, or the answer.

If you have a right triangle you can work that question backwards.

If you have any questions you can email me. My screen name is Eparisahana.

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Q: How do you find the missing length for a triangle?
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