The Law of Cosines (SSS) (8.2.2)

Question 1

• Review: The law of cosines has three forms. Use the form that fits the triangle:

a^2 = b^2 + c^2 - 2bcosα 
b^2 = a^2 + c^2 - 2acosβ 
c^2 = a^2 + b^2 - 2abcosγ

Answer 1

• Review: The law of cosines has three forms. Use the form that fits the triangle:

a^2 = b^2 + c^2 - 2bcosα 
b^2 = a^2 + c^2 - 2acosβ 
c^2 = a^2 + b^2 - 2abcosγ

Question 2

• Review: The law of cosines is used to solve a triangle when given three sides of a triangle or two sides plus the included angle.

Answer 2

• Review: The law of cosines is used to solve a triangle when given three sides of a triangle or two sides plus the included angle.

Question 3

• Review: The law of sines: (sin a)/a = (sin b)/b = (sin y)/c.

Answer 3

• Review: The law of sines: (sin a)/a = (sin b)/b = (sin y)/c.