Eastman 7th Math

Gretchen Eastman, Nov 10, 2014

These activities are for my students in 7th grade math at Springville, IA.

Table of Contents

  1. Stretching and Shrinking
    1. Perimeter Scale Factor vs Area Scale Factor
    2. Wumps
    3. Missing lengths in similar triangles
    4. Similar Triangles Problem
    5. Shadows and Right Triangles
  2. Circles
    1. Rolling a circle to find pi
    2. Area of a Circle
    3. Parts of a Circle

1.

Stretching and Shrinking

  • 1. Perimeter Scale Factor vs Area Scale Factor
  • 2. Wumps
  • 3. Missing lengths in similar triangles
  • 4. Similar Triangles Problem
  • 5. Shadows and Right Triangles

1.1.

Perimeter Scale Factor vs Area Scale Factor

Use the slider below to explore the relationships between scale factor, perimeter, and area.
As Square B doubles, triples, etc. in size compared to Square A, what happens to Square B's perimeter compared to Square A?[br][br]As the the Square B doubles, triples, etc. in size compared to Square A, what happens to Square B's area compared to Square A?[br][br]If Square B is 7 times larger than Square A, explain how you could determine the Square B's perimeter and area.[br][br]What is the relationship between scale factor and perimeter? [br][br]What is the relationship between scale factor and area?
– Chi Tran, arianashah

1.2.

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1.3.

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1.4.

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1.5.

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2.

Circles

  • 1. Rolling a circle to find pi
  • 2. Area of a Circle
  • 3. Parts of a Circle

2.1.

Rolling a circle to find pi

Roll the circle to "straighten out" the circumference. Then use the diameter tool to determine the number of diameters in one circumference.
– Duane Habecker

2.2.

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2.3.

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