8.10. Laws of Sines and Cosines http://www.ck12.org
8.10 Laws of Sines and Cosines
Here you’ll learn how to solve for missing sides and angles in non-right triangles using the Laws of Sines and
Cosines.
What if you wanted to solve for a missing side in a non-right triangle? How could you use trigonometry to help you?
After completing this Concept, you’ll be able to use the Law of Sines and the Law of Cosines to answer questions
like these.
Watch This
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Click image to the left for more content.CK-12 Foundation: Chapter8LawsofSinesandCosinesA
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Click image to the left for more content.James Sousa:TheLawof Sines
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Click image to the left for more content.James Sousa:TheLawof Cosines
Guidance
Law of Sines:If 4 ABChas sides of length,a,b, andc, thensinaA=sinbB=sincC.
Looking at a triangle, the lengthsa,b, andcare opposite the angles of the same letter.
UseLawofSineswhengiven:
- An angle and its opposite side.