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Earn +20 ptsQ: Use the law of cosines to write an expression for a2?
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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).
How do you find a missing side of a triangle without a right angle?
Having sufficient angles or sides one can use either, The Law of Sines, or, The Law of Cosines. Google them.
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
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