7th grade geometry

Rachel Bernard, Feb 27, 2017

Table of Contents

  1. Triangle and Quadrilateral Angles and Sides
    1. Triangle Angle Sum Theorem
    2. Animation 2
    3. Sum of interior angles of quadrilaterals
    4. Triangle Inequality
  2. Area Review
    1. Area and Perimeter of a Rectangle
    2. Parallelogram: Area
    3. Area of a Triangle (Discovery)
    4. Triangle Area Action!!! (V2)
    5. Area of a Trapezoid
    6. area of a trapezoid
    7. Area of Trapezoid - Midsegment
    8. Area of Trapezoid - Triangles
    9. Area of a Trapezoid
    10. Triangle Area Calculated via Rotation
  3. Cross Sections
    1. Sections of Triangular Prisms
    2. Cross Section? (1)

1.

Triangle and Quadrilateral Angles and Sides

  • 1. Triangle Angle Sum Theorem
  • 2. Animation 2
  • 3. Sum of interior angles of quadrilaterals
  • 4. Triangle Inequality

1.1.

Triangle Angle Sum Theorem

– Tim Brzezinski

1.2.

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1.3.

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1.4.

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2.

Area Review

  • 1. Area and Perimeter of a Rectangle
  • 2. Parallelogram: Area
  • 3. Area of a Triangle (Discovery)
  • 4. Triangle Area Action!!! (V2)
  • 5. Area of a Trapezoid
  • 6. area of a trapezoid
  • 7. Area of Trapezoid - Midsegment
  • 8. Area of Trapezoid - Triangles
  • 9. Area of a Trapezoid
  • 10. Triangle Area Calculated via Rotation

2.1.

Area and Perimeter of a Rectangle

Drag points B and C to change the dimensions of the rectangle.
– John Ulbright

2.2.

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2.3.

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2.4.

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2.5.

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2.6.

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2.7.

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2.8.

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2.9.

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2.10.

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3.

Cross Sections

  • 1. Sections of Triangular Prisms
  • 2. Cross Section? (1)

3.1.

Sections of Triangular Prisms

Drag the blue points to see the different sections of the triangular prism.
Anthony Or. GeoGebra Institute of Hong Kong
– Anthony OR 柯志明

3.2.

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