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GBK Geometry

GBK Geometry. Jordan Johnson. Today’s plan. Greeting Unit 8 (Ch. 7) Test, Part 1 Homework / Questions Clean-up. Pre-write Revisited. Re-read the “Pre-write” On a separate sheet of paper: Name / date / period at top-right corner. What can you correct now, from your pre-write?

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GBK Geometry

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  1. GBK Geometry Jordan Johnson

  2. Today’s plan • Greeting • Unit 8 (Ch. 7) Test, Part 1 • Homework / Questions • Clean-up

  3. Pre-write Revisited • Re-read the “Pre-write” • On a separate sheet of paper: • Name / date / period at top-right corner. • What can you correct now, from your pre-write? • What else have you learned about quadrilaterals? • What do you feel you need to review? • Staple your response to the front of your pre-write.

  4. Homework • Now, plus 25+ minutes tonight: • Proofs: • Prove that the base angles of a proper isosceles trapezoid are equal. • Given: Proper isosceles trapezoid ABCD,with legs AD = BC. • Prove: A = B (and C = D). • Hint: Through C, draw CE║DA (by the Parallel Postulate). • Prove that a proper trapezoid is isosceles iff its diagonals are equal. • Bonus: Prove: A proper trapezoid’s diagonals cannot bisect each other. • Given: Proper trapezoid ABCD with diagonals AC, BD. • Prove: AC and BD do not bisect each other. • Hint: Use an indirect proof. • Khan Academy recommendations

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

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