Law of Sines and Law of Cosines

Question 1

What is the Law of Sines?

Answer 1

For any triangle with side lengths a, b, and c: sinA/a=sinB/b=sinC/c.

Question 2

What is the Law of Cosines?

Answer 2

For any triangle with side lengths a, b, and c:
a^2=b^2+c^2-2bccosA
b^2=a^2+c^2-2accosB
c^2=a^2+b^2-2abcosC

Question 3

What can Sine and Cosine be used for?

Answer 3

They can be used to find angles and sides that are not given.