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9-12 Geometry Unit 4

Gradeband

K-5 Math 6-8 Math •9-12 Math

Course

Algebra 1 •Geometry Algebra 2 Extra Support Materials for Algebra 1

Unit

Unit 1 Unit 2 Unit 3 •Unit 4 Unit 5 Unit 6 Unit 7 Unit 8

Modeling Prompts

K-5
6-8
9-12

Algebra 1
Geometry
Algebra 2
Extra Support Materials for Algebra 1

Integrated Math 1
Integrated Math 2
Integrated Math 3

Unit 1
Unit 2
Unit 3
Unit 4
Unit 5
Unit 6
Unit 7
Unit 8

Modeling Prompts

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Learning Targets

Unit 4

Right Triangle Trigonometry

Section A

Angles and Steepness

Angles and Steepness

Let’s solve problems about right triangles.

Half a Square

Let’s investigate the properties of diagonals of squares.

Half an Equilateral Triangle

Let’s investigate the properties of altitudes of equilateral triangles.

Ratios in Right Triangles

Section B

Defining Trigonometric Ratios

Working with Trigonometric Ratios

Let’s solve problems using cosine, sine, and tangent.

Applying Ratios in Right Triangles

Let’s solve problems by using right triangles and trigonometry.

Sine and Cosine in the Same Right Triangle

Let’s connect cosine and sine.

Trigonometry Squared

Section C

Let’s Put It to Work

Solving Problems with Trigonometry

Let’s solve problems about right triangles.

Approximating Pi

Let’s approximate the value of .

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Unit 4 Resources

Family Materials

Let’s investigate ratios in the side lengths of right triangles.

Working with Ratios in Right Triangles

Let’s solve problems about right triangles.

Let’s connect the squares of some trigonometric ratios.

Using Trigonometric Ratios to Find Angles

Let’s work backwards to find angles in right triangles.

Section A

Angles and Steepness

Angles and Steepness

Let’s solve problems about right triangles.

Half a Square

Let’s investigate the properties of diagonals of squares.

Half an Equilateral Triangle

Let’s investigate the properties of altitudes of equilateral triangles.

Ratios in Right Triangles

Let’s investigate ratios in the side lengths of right triangles.

Working with Ratios in Right Triangles

Let’s solve problems about right triangles.

Section C

Let’s Put It to Work

Solving Problems with Trigonometry

Let’s solve problems about right triangles.

Approximating Pi

Let’s approximate the value of .

Section B

Defining Trigonometric Ratios

Working with Trigonometric Ratios

Let’s solve problems using cosine, sine, and tangent.

Applying Ratios in Right Triangles

Let’s solve problems by using right triangles and trigonometry.

Sine and Cosine in the Same Right Triangle

Let’s connect cosine and sine.

9

Trigonometry Squared

Let’s connect the squares of some trigonometric ratios.

Using Trigonometric Ratios to Find Angles

Let’s work backwards to find angles in right triangles.