Unit

#### Description:

In geometry, sine, cosine, and tangent are thought of as the value of ratios of triangles, not as functions.  No attempt is made to describe the trigonometric ratios as functions of the real number line.  Therefore, the notation is just an abbreviation for the “sine of an angle” ( ) or “sine of an angle measure” ( ).  Parentheses are used more for grouping and clarity reasons than as symbols used to represent a function.

#### Subjects:

• Mathematics > General
• Mathematics > Geometry

#### Keywords:

sine cosine ratio

English

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#### Collections:

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Update Standards?

#### CCSS.Math.Practice.MP2: Common Core State Standards for Mathematics

Reason abstractly and quantitatively.

#### CCSS.Math.Practice.MP3: Common Core State Standards for Mathematics

Construct viable arguments and critique the reasoning of others.

#### CCSS.Math.Practice.MP4: Common Core State Standards for Mathematics

Model with mathematics.

#### CCSS.Math.Practice.MP5: Common Core State Standards for Mathematics

Use appropriate tools strategically.

#### CCSS.Math.Practice.MP6: Common Core State Standards for Mathematics

Attend to precision.

#### CCSS.Math.Practice.MP7: Common Core State Standards for Mathematics

Look for and make use of structure.

#### CCSS.Math.Content.HSG-SRT.C.6: Common Core State Standards for Mathematics

Understand that by similarity, side ratios in right triangles are properties of the angles in the triangle, leading to definitions of trigonometric ratios for acute angles.
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