Triangles

• From Parallelograms to Triangles: IM 6.1.7

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GeoGebra Classroom Activities

• Finding Side Lengths of Triangles: IM 8.8.6

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GeoGebra Classroom Activities

• Regular Tessellations: IM 8.9.2

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GeoGebra Classroom Activities

• Tessellating Polygons: IM 8.9.3

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GeoGebra Classroom Activities

• Drawing Triangles (Part 1): IM 7.7.9

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GeoGebra Classroom Activities

• Drawing Triangles (Part 2): IM 7.7.10

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GeoGebra Classroom Activities

• Triangles with 3 Common Measures: IM 7.7.8

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GeoGebra Classroom Activities

• Fractional Lengths in Triangles and Prisms: IM 6.4.14

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GeoGebra Classroom Activities

• Similar Polygons: IM 8.2.7

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GeoGebra Classroom Activities

• Similar Triangles: IM 8.2.8

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GeoGebra Classroom Activities

• Polyon Interior Angles: Investigations

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Tim Brzezinski

• Adding the Angles in a Triangle: IM 8.1.15

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GeoGebra Classroom Activities

• The Shadow Knows: IM 8.2.13

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GeoGebra Classroom Activities

• Meet Slope: IM 8.2.10

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GeoGebra Classroom Activities

• Side Length Quotients in Similar Triangles: IM 8.2.9

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GeoGebra Classroom Activities

• Parallel Lines and the Angle in a Triangle: IM 8.1.16

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GeoGebra Classroom Activities

• Bases and Heights of Triangles: IM 6.1.10

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GeoGebra Classroom Activities

• Formula for the Area of a Triangle: IM 6.1.9

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GeoGebra Classroom Activities

• Area of Triangles: IM 6.1.8

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GeoGebra Classroom Activities

• Parallelograms: IM 6.1.4

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GeoGebra Classroom Activities

• Naming Congruent Triangles with Reasons

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Anthony OR 柯志明

• Triangle Angle Theorems

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Tim Brzezinski

• Triangle Exterior Angle

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Tim Brzezinski

• Triangle Angle Sum Theorem

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Tim Brzezinski