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Everyday MathGrade 4 – Lesson 1.3
Part 2: Triangles
Copyright © 2010 Kelly Mott
Copyright © 2010 Kelly Mott
Math Boxes Lesson 1.3
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Math Box 1:
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Math Box 2:
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Math Box 3:
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Math Box 4:
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Math Box 5:
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REVIEW
A __________ is a location in space that is usually marked with a dot.
Z
1. Line2. Line segment3. Point4. Ray
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A __________ is made up of a set of points and continues without end in
both directions.
1. Line2. Line segment3. Point4. Ray
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A __________ straight path that has a starting point and goes forever in one
direction.
1. Line2. Line segment3. Point4. Ray
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A __________ is made up of 2 points with a straight path between them.
1. Line2. Line segment3. Point4. Ray
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A
BC
Name the Angle
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Right Angle
90 degrees
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Name the AngleAcute Angle
Less than 90 degrees
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Name the AngleObtuse Angle
Greater than 90 degrees and less than 180 degrees
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Name the AngleStraight Angle
180 degrees
What kind of angles is this?
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1. Right2. Acute3. Obtuse4. Straight
What kind of angles is this?
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1. Right2. Acute3. Obtuse4. Straight
What kind of angles is this?
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1. Right2. Acute3. Obtuse4. Straight
What kind of angles is this?
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1. Right2. Acute3. Obtuse4. Straight
__________or _________ _____________________
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Name the Line, Line Segment, or Ray
X Y F G
__________or _________
__________or _________
__________or _________ __________or _________
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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
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Copyright © 2010 Kelly Mott
How did you do?
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Copyright © 2010 Kelly Mott
Lesson 1.3 Part 2Skill: Triangles
Part 1: What are triangles?
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• A triangle is a closed figure that has _____ angles.
• Label the angles above.
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What is an triangle?
• A triangle has 3 vertices: _______ _______ _______• A triangle has 3 sides: _______ _______ _______
_______ _______ _______ • A triangle has 3 angles: _______ _______ _______
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What is an triangle?
A
B C
Part 2: Naming Triangles
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• 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:
_______ _______ _______ _______ _______ _______
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How are triangles named?
X
Y Z
• Let’s try another.• This triangle has 6 possible names:
_______ _______ _______ _______ _______ _______
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How are triangles named?
D
E
F
• Let’s try one more.• This triangle has 6 possible names:
_______ _______ _______ _______ _______ _______
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How are triangles named?
P
Q R
Part 2: Types of Triangles
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Types of Triangles
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• This is an equilateral triangle• All _____ sides are the same length.• The angles of an equilateral triangle all measure ____ degrees.
Equilateral Triangle
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• j
Circle the Equilateral Triangles
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• This is an isosceles triangle• _____ sides are the same length and _____
angles are the same.
Isosceles Triangle
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• j
Circle the Isosceles Triangles
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• These are scalene triangles.• _____ sides are the same length.
Scalene Triangle
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• j
Circle the Scalene Triangles
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• These are right triangles.• One angle measures _____ degrees.
Right Triangle
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• A right triangle can sometimes be a _________________ triangle.
Right Triangle
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• j
Circle the Right Triangles
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Part 3: Review & Matching
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Polygons
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Isosceles Triangle
Polygons
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Equilateral Triangle
Polygons
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Scalene Triangle
Polygons
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Right Triangle
1. Equilateral
2. Isosceles
3. Scalene
4. Right
Match the Triangles
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Part 4: Turning Point Review
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Name the triangle.
Equila
tera
l
Isosce
les
Scalene
Right
0% 0%0%0%
1. Equilateral2. Isosceles3. Scalene4. Right
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Name the triangle.
Equila
tera
l
Isosce
les
Scalene
Right
0% 0%0%0%
1. Equilateral2. Isosceles3. Scalene4. Right
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Name the triangle.
Equila
tera
l
Isosce
les
Scalene
Right
0% 0%0%0%
1. Equilateral2. Isosceles3. Scalene4. Right
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Name the triangles.
Equila
tera
l
Isosce
les Righ
t
0% 0%0%
1. Equilateral2. Isosceles3. Right
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Name these triangles.
Equila
tera
l
Isosce
les
Scalene
Right
0% 0%0%0%
1. Equilateral2. Isosceles3. Scalene4. Right
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Name these triangles.
Equila
tera
l
Isosce
les
Scalene
Right
0% 0%0%0%
1. Equilateral2. Isosceles3. Scalene4. Right
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Name these triangles.
Equila
tera
l
Isosce
les
Scalene
0% 0%0%
1. Equilateral2. Isosceles3. Scalene
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Part 5: BRAIN POP - TRIANGLES
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BRAIN POPVideo:http://www.brainpop.com/math/geometryandmeasurement/typesoftriangles/Quiz:http://www.brainpop.com/math/geometryandmeasurement/typesoftriangles/quiz/
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How did you do?
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HOMEWORKPoster Showing Types of Triangles
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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?
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Copyright © 2010 Kelly Mott