Classifying Triangles by Angles
Movie Maker Video
Center #1
Developed by: Sheila Garner
Sulphur High School
GLEs:
Geometry
1. GLE-9: Construct 2- and 3-dimensional figures when given the name, description, or attributes,
with and without technology (G-1-H)
2. GLE-10: Form and test conjectures concerning geometric relationships including lines, angles,
and polygons (i.e., triangles, quadrilaterals, and n-gons), with and without technology
(G-1-H) (G-4-H) (G-6-H)
3. GLE-18: Determine angle measures and side lengths of right and similar triangles using
trigonometric ratios and properties of similarity, including congruence (G-5-H) (M-4-H)
Introduction:
You have been learning how to measure angles and classify triangles by angles. In this learning center, you will
apply that knowledge by creating a video with your team members that shows how to measure angles with a
protractor and how to find a missing angle if two angles are given. Your video will be used to instruct new
educators in teaching the use of protractors and relationships of the angles in triangles.
Essential questions:
 Triangle Classification:
1. What are the three types of triangles, classified by angles?
2. How many acute angles does an acute triangle have?
3. How many obtuse angles does an obtuse triangle have?
4. How many right angles does a right triangle have?

Sum of Angles in a Triangle:
5. What is the sum of angles in a triangle?
Task:
Acme Teacher Academy is looking for new tutorial videos for its math teacher education program. Acme is a
leader in all disciplines of teacher education and their on-line videos are used through the United States. You
and your team have been hired by Acme Teacher Academy to prepare a video on measuring angles and finding
missing angles of triangles. Your team will use a flip cam to record and Windows Live Moviemaker to prepare
and submit your video.
Process:
To accomplish this task, you and your team will complete the following step-by-step instructions:
1. You and your team will collaborate by filling out a worksheet on triangles. You will have to measure
the angles in the triangles and classify the triangles by their angles. You will also be given triangles with
two angles and you will have to find the third angle. Use the hyperlink Triangles to find the worksheet.
Be sure to assign roles and responsibilities before beginning the worksheets. See Step 2 for the roles and
responsibilities.
2. Your team will now select individual roles and responsibilities to complete the two graphs for the video
product.
Videographer: Your responsibility is to video the whole process of measuring angles and working
problems.
Math Instructor: Your responsibility is to complete the worksheet while your group collaborates
on the answers.
Narrator: Your responsibility is to narrate the entire process.
Movie Editor: You will be responsible for assembling the Movie. You will add and organize the
video, the graph, and the narration into a movie. To help you with this task, you can use the
Quicktip Sheet for Windows Movie Maker Live.
*Note: The video should include collaboratively filling out the worksheet.
As a team, review final project for accuracy. Be sure to include a Title Page at the beginning of the video
and a Credits Page at the end so that all team members are acknowledged for their work.
3. Save your project using one team member’s first.lastname plus the hour (ex. jane.doe_3rd) ). When you
save your movie, be sure to save it For Email. (That makes it smaller for uploading.)
4. Save the final project to your folder on the desktop.
Evaluation:
Attach rubrics and/or checklists here:
1. Video Rubric
Constructed Response:
Upon completion of this learning center, you should have learned to:
1. Measure an angle with a protractor.
2. Classify the angle as acute, right, or obtuse.
Solve the following problem:
1. Mars, Jupiter and Saturn were aligned in a triangular formation shown below.
M
S
J
a. Using a protractor, find the measure of each angle of the triangle.
b. Classify the triangle as acute, obtuse, or right.
2. Find the measure of the missing angle of the given triangle if the two base angles each measure 50°.
Place the response to your constructed response in your journal.
Adapted from resources found at the following website
http://webquest.sdsu.edu/templates/lesson-template1.htm Based on a template from The WebQuest Page