This lesson introduces, proves, and provides examples of the law of cosines.

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# The Law of Cosines

# Use the Law of Sines Twice to Find the Length of a Side of a Triangle (Lake Problem)

# Use the Law of Sines to Find the Length of a Side of a Triangle After Finding 3rd Angle

# Use the Law of Cosines to Find the Measure of an Angle of a Triangle (SSS)

# Use the Law of Cosines to Find the Length of a Side of a Triangle (SAS)

# Solve a Triangle Using the Law of Cosines and the Law of Sines

# The Law of Sines – Two Solutions (SSA)

This lesson introduces, proves, and provides examples of the law of cosines.

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This video explains how to use the law of sines twice to determine the distance across a lake

This video explains how to find the length of the side of a triangle using the law of sines.

This video explains how to find the measure of an angle of a triangle using the law of cosines.

This video explains how to find the length of a side of a triangle using the law of cosines.

This video explains how to solve a triangle using the law of cosines and then the law of sines.

This video use the Law of Sines to solve a triangle when there is 2 solutions from the given information.