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Counting Triangles

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Counting Triangles

Students will use transformations implicitly to count the number of shaded triangles in a diagram. During sharing of strategies and through annotation, the transformations used will be made explicit.

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• Unit 1

#### Tools of Geometry

Find the Value of an Angle

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Find the Value of an Angle

Students will use what they know about angles in diagrams to find the value of a missing angle.

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• Unit 2

Proof Using a Construction

Resource:
Proof Using a Construction

Students will use parts of a construction to prove a triangle is equilateral.

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• Unit 1

#### Tools of Geometry

Prove Points Form a Right Triangle

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Prove Points Form a Right Triangle

Students will use what they know about finding distances in a coordinate plane and right triangles to prove that three pairs of coordinates form a right triangle.

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• Unit 6

#### Coordinate Geometry

Transforming a Triangle

Resource:
Transforming a Triangle

Students will use transformations implicitly to confirm that two triangles are congruent in order to find a missing length. During sharing of strategies and through annotation, the transformations used will be made explicit.

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• Unit 6

#### Coordinate Geometry

Which One Doesn't Belong (Sample Slides)

Resource:
Which One Doesn't Belong (Sample Slides)

Which One Doesn't Belong is an instructional activity that uses MP3 "Construct viable arguments and critique the reasoning of others." Emphasis is on the first part of the standard - construct viable arguments. Through the activity, students practice justifying their ideas using mathematical language. They learn that there is no one correct answer so long as their choice is supported with evidence.
This activity can be introduced in Unit 0 and used throughout the school year.