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GBK Geometry

GBK Geometry. Jordan Johnson. Today’s plan. Greeting Polyomino Blow-Ups Homework / Questions Clean-up. Polyomino Questions. What happens when you double, triple, or quadruple a polyomino in both dimensions? What’s the relationship between the scale factor and the ratio of perimeters?

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GBK Geometry

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  1. GBK Geometry Jordan Johnson

  2. Today’s plan • Greeting • Polyomino Blow-Ups • Homework / Questions • Clean-up

  3. Polyomino Questions • What happens when you double, triple, or quadruple a polyomino in both dimensions? • What’s the relationship between the scale factor and the ratio of perimeters? • What’s the relationship between the scale factor and the ratio of areas? • Why is 2’s answer different from 3’s?

  4. Theorems: Perimeter & Area • If two triangles are similar, the ratio of their perimeters equals the ratio of their corresponding sides. • If two triangles are similar, the ratio of their areas equals the square of the ratio of their corresponding sides.

  5. Homework / Lab • 50+ minutes between now and Monday: • Asgs #67-71 • Now, to the computer lab: • 15+ min: Take one of the recent proofs we’ve done; type it up neatly with appropriate diagrams from GeoGebra. • Khan Academy exercises – look for similarity and area • I’ll stop you with time left for the journal.

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

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