learning objective students will identify attributes of triangles. skill concept context
TRANSCRIPT
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Learning Objective
Students will identify attributes of triangles.
skill concept context
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Prior Knowledge
On your whiteboard, draw the shape of this sign.
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This shape is a triangle. Triangles come in different shapes. Today you are going to learn some new names for triangles.
triangle
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Prior Knowledge
Whiteboard:Draw two differentthree-sided figures.
Share Out:Hold up your whiteboard.Look around the room to see what your classmates
have drawn.
triangle
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Examples of Triangles
Triangle means “three sides”
Any three-sided shape is a trianglebut only if each of the three sides are
straight.
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Non-Examples of Triangles
These are not triangles because they do not have three sides.
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Why is it important to know about different triangles?
Triangles are used in buildings and bridges.
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Concept Development Definition
All triangles have special names
based on the length of their sides.
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Special Triangles have special names
Let’s learn about what makes these triangles special…
isosceles
equilateral
scalene
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Equilateral Triangle
All triangles have special names based on the length of their sides.
A triangle thathas three sides of equal length.
4 cm4 cm
4 cm
6 cm6 cm
6 cm
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Isosceles Triangle
All triangles have special names based on the length of their sides.
A triangle thathas two sides of equal length.
7 cm
4 cm
7 cm
9 cm
9 cm
5 cm
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Scalene Triangle
All triangles have special names based on the length of their sides.
A triangle thathas no sides of equal length.
3 cm
5 cm
8 cm
6 cm
9 cm
4 cm
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Concept Development Definition
All triangles have special names based on the length of their sides.
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Guided Practice #1
Pair share: Why does the triangle have this special name?
Whiteboard: What is the special name for this triangle?
has three sides of equal length.
All triangles have special names based on the length of their sides.
6 cm6 cm
6 cmAn equilateral triangle
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Guided Practice #2
Pair share: Why does the triangle have this special name?
Whiteboard: What is the special name for this triangle?
has two sides of equal length.
All triangles have special names based on the length of their sides.
7 cm
4 cm
7 cm
An isosceles triangle
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Guided Practice #3
Pair share: Why does the triangle have this special name?
Whiteboard: What is the special name for this triangle?
A scalene triangle has no sides of equal length.
All triangles have special names based on the length of their sides.
3 cm
5 cm
8 cm
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What is our Definition?
All triangles have special names based on the length of their sides.
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Time for
Independent Practice
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What Did We Learn
Students will identify triangles by their attributes.
1. Are all triangles the same?2. What is the name of a triangle with 3
sides that are the same length?3. What is the name of the triangle with 2
sides that are the same length?4. What is the name of a triangle with no
sides that are the same length?