This 90-minute lesson plan teaches students about measuring angles using 45, 90, and 180 degrees as references. Students will estimate angle measures visually and use tools to check their estimates. They will draw and measure acute, right, and obtuse angles and triangles. The lesson uses TRX pictures with recorded audio explanations of different angle types. Students participate kinesthetically with paddles to answer questions. Worksheets assess their understanding of measuring angles in class and at home.

1. Chelsea Prue 1
Lesson Plan: TRX and Angles
Introduction
• Lesson Topic: TRX and Angles
• Length of Lesson: 90 minutes (1 block)
• VA Standards of Learning: Mathematics 6.13: The student will
a. estimate angle measures, using 45°, 90°, and 180° as referents, and use the appropriate tools
to measure the given angles; and
b. measure and draw right, acute, and obtuse angles and triangles.
Cognitive Objectives
Students will:
• Estimate visually the angle measure of a given angle by using 45°, 90°, and 180° as referents, and use
appropriate tools to check the reasonableness of the estimate.
• Draw and measure acute, right, and obtuse angles, using appropriate tools.
• Draw and measure acute, right, and obtuse triangles, using appropriate tools.
Materials/Technology and Advanced Preparation
• TRX pictures with recorded audio explaining 45°, 90°, and 120° and 180° angles.
• Class website to post audio file.
• Laptops and headphones for all students.
• Image projector to show pictures with recorded audio.
• Greater Than/Less Than & Acute/Obtuse ping-pong paddles for kinesthetic involvement.
• ‘Angle Hunt: In Class’ worksheet for all students.
• ‘Angle Hunt: At Home’ worksheet for all students.
Teaching and Learning Sequence
Introduction/Anticipatory Set
• Students draw an acute angle, a right angle, and an obtuse angle.
o Briefly review as a class what makes an angle acute (<90°), right (=90°), and obtuse (>90°).
• Show TRX pictures with recorded audio explaining 45°, 90°, and 120° and 180° angles.
Lesson Development
• Hand out Greater Than/Less Than & Acute/Obtuse ping-pong paddles for kinesthetic involvement.
• Show TRX pictures with recorded audio again. This time, students hold up their paddle representing their
answer to questions in the recorded audio.
• In pairs, students go around the room drawing and measuring right, acute, and obtuse angles and triangles.
Items/pictures have been strategically placed around the room to facilitate this activity.
o Students fill out ‘Angle Hunt: In Class’ worksheet in pairs.
Closure
• Each pair of students reports one of their angle findings from the class activity. Explain what you put on the
‘Angle Hunt: In Class’ worksheet.

2. Chelsea Prue 2
Lesson Plan: TRX and Angles
• Hand out ‘Angle Hunt: At home’ homework worksheet.
Homework
• ‘Angle Hunt: At Home’ worksheet.
Assessment
Formative
• Pictures with recorded audio file encourages students to participate in the lesson in a call-and-response
format.
• Students must find and draw different measures of angles, demonstrating new knowledge.
Summative
• ‘Angle Hunt: In Class’ worksheet demonstrates students’ understanding of the material and serves as an aid
for the homework activity.
• ‘Angle Hunt: At Home’ worksheet demonstrates students’ understanding of the material as it relates to
triangles as well as angles.
Appended Materials
- ‘Angle Hunt: In Class’ worksheet
- ‘Angle Hunt: At Home’ homework worksheet

3. Chelsea Prue 3
Lesson Plan: TRX and Angles