Triangles

Parent topic:: Plane Figures or Shapes, Trigonometry

Parallelograms: IM 6.1.4
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From Parallelograms to Triangles: IM 6.1.7
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Area of Triangles: IM 6.1.8
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GeoGebra Classroom Activities
Formula for the Area of a Triangle: IM 6.1.9
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Bases and Heights of Triangles: IM 6.1.10
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Parallel Lines and the Angle in a Triangle: IM 8.1.16
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Side Length Quotients in Similar Triangles: IM 8.2.9
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Meet Slope: IM 8.2.10
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The Shadow Knows: IM 8.2.13
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Adding the Angles in a Triangle: IM 8.1.15
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Polyon Interior Angles: Investigations
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Tim Brzezinski
Similar Triangles: IM 8.2.8
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Similar Polygons: IM 8.2.7
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Fractional Lengths in Triangles and Prisms: IM 6.4.14
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Triangles with 3 Common Measures: IM 7.7.8
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Drawing Triangles (Part 2): IM 7.7.10
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Drawing Triangles (Part 1): IM 7.7.9
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Tessellating Polygons: IM 8.9.3
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Regular Tessellations: IM 8.9.2
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GeoGebra Classroom Activities
Finding Side Lengths of Triangles: IM 8.8.6
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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