Law of Sines & Cosines

Question 1

Write the Law of Sines

Answer 1

a/sin A = b/sin B = c/sin C

Question 2

Write the Law of Cosines

Answer 2

c^2 = a^2 + b^2 − 2ab cos(C)

Question 3

When do you use the Law of Sines?

Answer 3

For Triangles:

1) When you know 2 angles and one side
2) When you know 2 sides and a non-included angle

Question 4

When do you use the Law of Cosines?

Answer 4

For Triangles:

1) When you know the length of 2 sides and the angle between them
2) When you know 3 sides