Missing Angles in Congruent Triangles

Grade 9 General- Lesson

Congruent Triangles

13.2 Angles of Triangles

Objective

Learning Objectives

13.2.1 Use the sum of angles in a triangle is 180° to find missing measures in a triangle 

13.2.2 Use the measure of an exterior angle of a triangle to find measures of missing angles 

13.2.3 Demonstrate an understanding of the Triangle Angle-Sum Corollaries 

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Warm up Activity

LMS

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Angles in Triangle - Vertical and Supplementary Angles

Page 2

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Sum of angles in triangle is 180

-Watch the video on page 4 of LMS

-Teacher's Explanation in classkick

Practice In Classkick

Worksheet

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Multiple Choice

Question

Choose the correct measure for angle x

• 110

• 20

• 40

• 60

• 63

Group Activity

Go to break out rooms

Watch the video in next slide

Discuss and answer the questions in padlet

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Desmos Activity

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Assessment in MS Teams

Exit Ticket

Mentimeter link on next page

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13.2 Sum of Interior Angles Theorem and 13.2 Measure of an exterior angle of triangle to find missing measures in triangle

Day 2

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Activity

LMS

Angles in a Triangle

Page 4

Post your asnwers in padlet

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Multiple Choice

Question

Choose the correct measure for angle x

• 153

• 73

• 53

• 243

• 63

Multiple Choice

Question

Choose the correct measure for angle x

• 110

• 20

• 40

• 60

• 63

Desmos Activity 1

Multi Level Tasks

Find your name from padlet Teamslink

Solve the questions

Post your answers in assigned padlet Pink or Blue

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Exterior Angle Theorem

Day 3

Activity

LMS

Angles in a Triangle

Page 5

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Triangle Sum Additional Rules

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Classkick Practice

Page 3,4 and 5

Fill in the Blanks

a+b=

x=

Complete the activity on LMS Page 7 of Angles of Triangles Unit

Share your answers with class on padlet

https://padlet.com/aneeqailyas/izel9yrquq49ecgt

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Differentiation

Find your name from padlet Teamslink

Solve the questions

Post your answers in assigned padlet Pink or Blue

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Group Work

Sharepoint

Multiple Choice

what is measure of exterior angle x

• 100

• 20

• 110

• 25

Assessment in MS Teams

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