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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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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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Is It On the Circle?

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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.

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Isosceles Triangles

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Isosceles Triangles

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

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Proof Using a Construction

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Proof Using a Construction

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

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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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Transforming a Triangle

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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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