# TEMPLATE LINK FOR TEACHERS TO CONTRIBUTE: - Get as DOC by ZpabO0T8

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```									               SolidWorks Lesson Template for Teachers to Contribute

Cover Sheet for Exemplary Lessons/Units Project

Faculty Member Name: M. Planchard Date: 4/17/06

School District: N/A
Title of Lesson/Unit: Unit Circle - Triangle

Applicable for Trigonometry, PreCalculus, Calculus and Physics.
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Science, Technology, Engineering and Math) STEM Concepts Addressed: This
lesson develops the Unit circle of radius 1, x-axis and y-axis sketched on the unit circle
and compares how these values are the solution to cosine and sine. The x coordinate of a
hypotenuse of a right triangle on the unit circle is its cosine value. The y coordinate of
the hypotenuse of a right triangle on a unit circle is its sine value.

Length of instruction period: 50 minutes
How many periods needed to implement lesson unit: ____<1

Objectives:
1. Understand the relationship between a right triangle and a unit circle when the
hypotenuse rests on the unit circle.
2. Apply the x axis and y axis to the unit circle to illustrate the relationship between
cosine and sine with x and y coordinates.
3. Illustrate how changes in the angle modify values of cosine and sine.

After years of teaching Calculus and Physics, common triangle values for 30, 45 and 60
degrees should be known. In a pre-calculus or higher math based class values in 30
degree increments and in terms of PI/6 for sine, cosine and tangent should be memorized.

Materials: SolidWorks, paper and pencil.

Procedures:
 On the Front Plane, Sketch a Circle of radius 1, (Diameter equals 2). Click the
For Construction Check box.
 Sketch a horizontal centerline that represents the x axis. Sketch a vertical
centerline that represents the y axis.
 Sketch an angled line with one point at the origin and 1 point coincident with the
circumference of the circle.
 Dimension the angle.
 Create a horizontal dimension from the Origin to the end of the angled line. Click
Yes to make the dimension driven.
 Create a vertical dimension from the Origin to the end of the angled line.
 Modify the angular dimensions and the values for x and y change.
Assessment: _On their own, have students calculate the values for sine and cosine using
SolidWorks for common angles from 0 to 180 in 30 degree increments.

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Resources Used: ____N/A___