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Earn +20 ptsQ: When and where was the law of cosines created?
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Law of cosines with a right angle?
The law of cosines with a right angle is just the pythagorean theorem. The cosine of 90 degrees is 0. That is why the hypotenuse squared is equal to the sum of both of the legs squared
What are the answers to law of cosines in A plus?
The law of cosines can be written in one form as: c2 = a2 + b2 - 2abCos C. Without 3 of the 4 variables being given, there is no way to answer this question.
Can the law of cosines be applied to right and non-right triangles?
Yes
How are all three versions of the law of cosines correct?
It follows from the cyclical symmetry of the cosine rule.
How do you figure out the area of a triangle when you only know the sides?
Use the law of cosines (look them up on wikipedia).
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