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Counting Triangles Resource:
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.

All Resources From:
• Unit 1

Tools of Geometry

Find the Value of an Angle Resource:
Find the Value of an Angle

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

All Resources From:
• Unit 2

Is It On the Circle? Resource:
Is It On the Circle?

Students use what they know about finding distances in a coordinate plane and right triangles to prove that a point lies on a circle through another point.

All Resources From:
• Unit 7

Circles

Isosceles Triangles Resource:
Isosceles Triangles

Students use triangle congruence proofs to show that two angles are congruent.

All Resources From:
• Unit 2

Proof Using a Construction Resource:
Proof Using a Construction

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

All Resources From:
• Unit 1

Tools of Geometry

Prove Points Form a Right Triangle Resource:
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.

All Resources From:
• 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.

All Resources From:
• Unit 6