Everyday Math Grade 4 – Lesson 1.3 Part 2: Triangles Copyright © 2010 Kelly Mott.

Everyday MathGrade 4 – Lesson 1.3

Part 2: Triangles

Copyright © 2010 Kelly Mott


Math Boxes Lesson 1.3


Math Box 1:


Math Box 2:


Math Box 3:


Math Box 4:


Math Box 5:


REVIEW

A __________ is a location in space that is usually marked with a dot.

Z

1. Line2. Line segment3. Point4. Ray


A __________ is made up of a set of points and continues without end in

both directions.



A __________ straight path that has a starting point and goes forever in one

direction.



A __________ is made up of 2 points with a straight path between them.



A

BC

Name the Angle


Right Angle

90 degrees


Name the AngleAcute Angle

Less than 90 degrees


Name the AngleObtuse Angle

Greater than 90 degrees and less than 180 degrees


Name the AngleStraight Angle

180 degrees

What kind of angles is this?


1. Right2. Acute3. Obtuse4. Straight

__________or _________ _____________________


Name the Line, Line Segment, or Ray

X Y F G

__________or _________

__________or _________

__________or _________ __________or _________


Name the Line, Line Segment, or Ray

L M N Q R

Names:1. ___________________2. ___________________3. ___________________

B

A

C

Name the Angles

ED

FNames:1. ___________________2. ___________________3. ___________________

JK

L


How did you do?



Lesson 1.3 Part 2Skill: Triangles

Part 1: What are triangles?


• A triangle is a closed figure that has _____ angles.

• Label the angles above.


What is an triangle?

• A triangle has 3 vertices: _______ _______ _______• A triangle has 3 sides: _______ _______ _______

_______ _______ _______ • A triangle has 3 angles: _______ _______ _______


What is an triangle?

A

B C

Part 2: Naming Triangles


• Triangles have three letter names. • You name a triangle by listing the letter

names for the vertices in order.• This triangle has 6 possible names:

_______ _______ _______ _______ _______ _______


How are triangles named?

X

Y Z

• Let’s try another.• This triangle has 6 possible names:

_______ _______ _______ _______ _______ _______



D

E

F

• Let’s try one more.• This triangle has 6 possible names:

_______ _______ _______ _______ _______ _______



P

Q R

Part 2: Types of Triangles


Types of Triangles


• This is an equilateral triangle• All _____ sides are the same length.• The angles of an equilateral triangle all measure ____ degrees.

Equilateral Triangle


• j

Circle the Equilateral Triangles


• This is an isosceles triangle• _____ sides are the same length and _____

angles are the same.

Isosceles Triangle


• j

Circle the Isosceles Triangles


• These are scalene triangles.• _____ sides are the same length.

Scalene Triangle


• j

Circle the Scalene Triangles


• These are right triangles.• One angle measures _____ degrees.

Right Triangle


• A right triangle can sometimes be a _________________ triangle.

Right Triangle


• j

Circle the Right Triangles


Part 3: Review & Matching


Polygons


Isosceles Triangle

Polygons


Equilateral Triangle

Polygons


Scalene Triangle

Polygons


Right Triangle

1. Equilateral

2. Isosceles

3. Scalene

4. Right

Match the Triangles


Part 4: Turning Point Review


Name the triangle.

Equila

tera

l

Isosce

les

Scalene

Right

0% 0%0%0%

1. Equilateral2. Isosceles3. Scalene4. Right


Name the triangles.

Equila

tera

l

Isosce

les Righ

t

0% 0%0%

1. Equilateral2. Isosceles3. Right


Name these triangles.

Equila

tera

l

Isosce

les

Scalene

Right

0% 0%0%0%

1. Equilateral2. Isosceles3. Scalene4. Right


Name these triangles.

Equila

tera

l

Isosce

les

Scalene

0% 0%0%

1. Equilateral2. Isosceles3. Scalene


Part 5: BRAIN POP - TRIANGLES


BRAIN POPVideo:http://www.brainpop.com/math/geometryandmeasurement/typesoftriangles/Quiz:http://www.brainpop.com/math/geometryandmeasurement/typesoftriangles/quiz/

Copyright © 20010Kelly Mott

http://www.brainpop.com/math/geometryandmeasurement/typesoftriangles/



http://www.brainpop.com/math/geometryandmeasurement/typesoftriangles/quiz/



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HOMEWORK : TRIANGLE POSTER

Isoceles- 2 sides equal

Scalene- no sides equal

Right- 1 right angle

Equilateral- all sides equal

Does this make sense?


Everyday Math Grade 4 – Lesson 1.3 Part 2: Triangles Copyright © 2010 Kelly Mott.

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