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GBK Geometry

GBK Geometry. Jordan Johnson. Today’s plan. Greeting Warm-up: Area Exercises Trapezoid Area Proofs: Conclusion Homework / Questions Clean-up. Area Exercises. In pairs, do (from Ch. 9 Lesson 4, p. 362): Set II, Exercises 30-36. Write your own copy of the work. 15 min.

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GBK Geometry

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  1. GBK Geometry Jordan Johnson

  2. Today’s plan • Greeting • Warm-up: Area Exercises • Trapezoid Area Proofs: Conclusion • Homework / Questions • Clean-up

  3. Area Exercises • In pairs, do (from Ch. 9 Lesson 4, p. 362): • Set II, Exercises 30-36. • Write your own copy of the work. • 15 min.

  4. Reminder: Open Problem:Cube Dissection • Suppose you have a 3” x 3” wooden cube and want to saw it into twenty-seven 1” x 1” cubes. • What is the minimal number of cuts needed?

  5. Period 1

  6. Period 2

  7. Period 2

  8. Period 5

  9. Period 7

  10. Period 7

  11. Trapezoid area • Area of a trapezoid = ½(b1 + b2)hwhere b1 and b2 are the bases and h is the altitude Q: Would this formula work for parallelograms too?

  12. Homework • Read at least one trapezoid area proof. • Any assignment from #59 to #62.

  13. Clean-up / Reminders • Pick up all trash / items. • Push in chairs (at front and back tables). • See you tomorrow!

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