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# Law of Cosines

## Relationship between the three sides and an angle for non-right triangles.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
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## Solving triangles using the Law of Cosines - Overview

by CK-12 //basic

Overview

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## Solving Two-Variable Linear Systems - Overview

by CK-12 //basic

Overview

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## Solving triangles using the Law of Cosines - Example 1

by CK-12 //basic

Solve a triangle given three sides - SSS

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## Solving triangles using the Law of Cosines - Example 2

by CK-12 //basic

Solve a triangle given two sides and the included angle - SAS

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## Solving triangles using the Law of Cosines - Example 3

by CK-12 //basic

Word Problems - Find the distance

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## Solving triangles using the Law of Cosines - Example 4

by CK-12 //basic

Word Problems - Find the angle

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## Solving Two-Variable Linear Systems - Example 1

by CK-12 //basic

Determine whether the ordered pair is a solution of the system of linear equations

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## Solving Two-Variable Linear Systems - Example 2

by CK-12 //basic

Solve a system using the elimination method

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## Solving Two-Variable Linear Systems - Example 3

by CK-12 //basic

Solve a system using the substitution method

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## Solving Two-Variable Linear Systems - Example 4

by CK-12 //basic

Solve a linear system by graphing

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## Solving Two-Variable Linear Systems - Example 5

by CK-12 //basic

Word Problems - Airplane Speed

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## Solving Two-Variable Linear Systems - Example 6

by CK-12 //basic

Word Problems - Supply and Demand

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