Learning Objective Students will identify attributes of triangles. skill concept context.

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Presentation transcript:

Learning Objective Students will identify attributes of triangles. skill concept context

Prior Knowledge On your whiteboard, draw the shape of this sign.

This shape is a triangle. Triangles come in different shapes. Today you are going to learn some new names for triangles. triangle

Prior Knowledge Whiteboard: Draw two different three-sided figures. Share Out: Hold up your whiteboard. Look around the room to see what your classmates have drawn. triangle

Examples of Triangles Triangle means “three sides” Any three-sided shape is a triangle but only if each of the three sides are straight.

Non-Examples of Triangles These are not triangles because they do not have three sides.

Why is it important to know about different triangles? Triangles are used in buildings and bridges.

Concept Development Definition All triangles have special names based on the length of their sides.

Special Triangles have special names Let’s learn about what makes these triangles special… isosceles equilateral scalene

Equilateral Triangle All triangles have special names based on the length of their sides. A triangle that has three sides of equal length. 4 cm 6 cm

Isosceles Triangle All triangles have special names based on the length of their sides. A triangle that has two sides of equal length. 7 cm 4 cm 7 cm 9 cm 5 cm

Scalene Triangle All triangles have special names based on the length of their sides. A triangle that has no sides of equal length. 3 cm 5 cm 8 cm 6 cm 9 cm 4 cm

Concept Development Definition All triangles have special names based on the length of their sides.

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 cm An equilateral triangle

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

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

What is our Definition? All triangles have special names based on the length of their sides.

Time for Independent Practice

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?