Geometry, Teacher\'s Edition

III.SpecialNeeds/Modifications

Review the parts of a triangle.

Remind students that thexin the cosine and sine ratios refers to the angle that we are focusing on.

Break down the two formulas and write them on the board. Request that the students copy them down in their
notebooks.

Allow extra time for questions.

IV.AlternativeAssessment

Collect student work after the activity.

Use this to assess student understanding and provide extra support for students who are having difficulty.

Inverse Trigonometric Ratios

I.SectionObjectives

Identify and use the arctangent ratio in a right triangle.

Identify and use the arcsine ratio in a right triangle.

Identify and use the arccosine ratio in a right triangle.

Understand the general trends of trigonometric ratios.

II.MultipleIntelligences

The best way to differentiate this lesson is to break down the information in the lesson. This will help all
students.

Here are some notes to give the students as you teach the information in the lesson.

Inverse of a trigonometric function has the word arc in front of it.

Inverse Tangents

Convert measurement to degrees in two ways.

This will give you the measure of the angle in degrees.

Notice that we use the approximately symbol for measurements that are not exact.

Point this out for students in the lesson examples.

Inverse Sine

You can find the arcsine by the same two methods as the arctangent.

This converts the measurement to degrees.

Inverse Cosine

You can find the arccosine the same two ways.

This will convert the measurement to degrees.

III.SpecialNeeds/Modifications

Begin with some work on inverses.

Be sure that students understand an inverse of an operation undoes the operation.

Use a one- step equation to show students this.

Then use the notes in the Multiple Intelligences section to break down the content for the students.

IV.AlternativeAssessment

Chapter 4. Geometry TE - Differentiated Instruction