Triangle Basics Lesson

Presentation

•

Mathematics

•

KG - 10th Grade

•

Practice Problem

•

Medium

•

CCSS

4.G.A.2, 8.G.A.5, 8.G.B.8

Standards-aligned

Ashley Painter

Used 21+ times

FREE Resource

8 Slides • 13 Questions

Unit 4: Triangles

Notes: Pg 44-47

During this lesson, you will complete notes and practice for each section.

P.S.... THIS IS A GRADE!

Important Information:

There are 3 angles, 3 sides (line segments), and 3 vertices (corners).
The angles of a triangle add up to 180 degrees.
You name a triangle using the 3 vertices.

Triangle Basics: Complete the following notes on Pg. 44.

Multiple Select

Select all the possible names for this triangle.

$\Delta PQR$

$\Delta QR$

$\Delta P$

$\Delta QPR$

$\Delta RPQ$

Multiple Choice

If $m\angle E$ is $23\degree$ and the $m\angle G$ is $23\degree$ , what is the $m\angle F$ ?

$m\angle F\ =\ 23\degree$

$m\angle F\ =157\degree$

$m\angle F\ =\ 134\degree$

Important Information:

You can classify a triangle based on its angles and/or its sides.
Pay close attention to the markings on each type of triangle.
A dash through the sides shows that those sides have the same measure.

Classifying Triangles: Complete the following notes on Pg. 45.

Multiple Choice

Classify this triangle by its sides.

Equilateral Triangle

Scalene Triangle

Isosceles Triangle

Multiple Choice

Classify this triangle by its angles.

Acute Triangle

Obtuse Triangle

Right Triangle

Equiangular Triangle

Multiple Choice

Classify this triangle by its angles.

Acute Triangle

Obtuse Triangle

Right Triangle

Equiangular Triangle

Multiple Select

Classify this triangle by its angles.

Acute Triangle

Obtuse Triangle

Right Triangle

Equiangular Triangle

Multiple Choice

Classify this triangle by its sides.

Equilateral Triangle

Scalene Triangle

Isosceles Triangle

Multiple Choice

Classify this triangle by its sides.

Scalene Triangle

Isosceles Triangle

Equilateral Triangle

Important Information:

The 3 angles HAVE TO EQUAL 180 degrees!

Angle Theorems Part 1: Complete the following notes on Pg. 46.

Important Information:

Both triangles are congruent, therefore the matching angles are also congruent.

Angle Theorems Part 1: Complete the following notes on Pg. 46.

Multiple Choice

Using the Angle Sum Theorem, find the $m\angle1$ .

$24\degree$

$37\degree$

$119\degree$

$180\degree$

Multiple Choice

Using the Angle Sum Theorem, find the $m\angle1$ .

$61\degree$

$68\degree$

$51\degree$

$180\degree$

Important Information:

To get the exterior angle, just add the two angles furthest away.

Angle Theorems Part 1: Complete the following notes on Pg. 47.

Important Information:

If two sides are congruent, two angles will be as well.

Angle Theorems Part 1: Complete the following notes on Pg. 47.

Multiple Choice

Using the Exterior Angle Theorem, find the $m\angle1$ .

$76\degree$

$52\degree$

$128\degree$

$180\degree$

Multiple Choice

Using the Exterior Angle Theorem, find the $m\angle1$ .

$104\degree$

$79\degree$

$25\degree$

$183\degree$

Multiple Choice

Using the Isosceles Triangle Theorem, find the $m\angle J$ .

$68\degree$

$112\degree$

$44\degree$

Assignment - IXL F.2 and F.3

These are due by Monday 10/24/22

Subject | Subject

Unit 4: Triangles

Notes: Pg 44-47

During this lesson, you will complete notes and practice for each section.

P.S.... THIS IS A GRADE!

Show answer

Auto Play

Slide 1 / 21

SLIDE

Similar Resources on Wayground

16 questions

One Step Equations - Lesson

Presentation

•

6th Grade

16 questions

Simple Interest

Presentation

•

6th - 8th Grade

16 questions

Parts of an expression

Presentation

•

6th Grade

16 questions

Distributing a Negative

Presentation

•

7th Grade

16 questions

Customary Capacity

Presentation

•

5th Grade

16 questions

Difference in squares

Presentation

•

9th Grade

16 questions

Multiply by Multiples of 10

Presentation

•

3rd Grade

16 questions

System of Equations

Presentation

•

6th Grade

Popular Resources on Wayground

24 questions

PBIS-HGMS Day 10

Quiz

•

6th - 8th Grade

10 questions

HCS SCI 03 Summer School Review 3

Quiz

•

3rd Grade

11 questions

Home Scope

Quiz

•

7th - 8th Grade

15 questions

HCS SCI 05 Summer School Assessment 3 Review

Quiz

•

5th Grade

35 questions

Lufkin Road Middle School Student Handbook & Policies Assessment

Quiz

•

7th Grade

18 questions

Geo 11.3 Area of Circles and Sectors

Quiz

•

9th - 11th Grade

Discover more resources for Mathematics

18 questions

Geo 11.3 Area of Circles and Sectors

Quiz

•

9th - 11th Grade