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2 cards from this section. Quick, good the night before a test.
What is the Law of Cosines formula?
Remember, it's about one side and the cosine of the included angle.
If a = 3, b = 4, and angle A = 60°, find side c using the Law of Cosines.
Substitute values carefully into the cosine formula.
What does the Law of Cosines relate?
Consider what is involved with side lengths.
True or False: The Law of Cosines can only be used for right triangles.
Think about the types of triangles you've learned!
A triangle has sides of lengths a = 11, b = 24 and c = 30. Calculate the angle opposite side a.
Carefully input side lengths into the formula.
You have a triangle with side lengths 6, 8, and 10. Determine if the triangle is acute, right or obtuse.
Check for each angle using the sides!
4 more questions in this section. Enroll free to practise them all.
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