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Friday, January 6, 2012

Friday, January 6, 2012. No HW. Study for Ch. 7 on Wed 1/11 Warm Up – Complete #20 on back of HW – “An architect …”. An architect …. Agenda. Review of Area of Irregular Figures Review Study Guide Practice with finding area. Area of Irregular Figures. Don’t assume anything!.

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Friday, January 6, 2012

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  1. Friday, January 6, 2012 • No HW. • Study for Ch. 7 on Wed 1/11 • Warm Up – Complete #20 on back of HW – “An architect …”

  2. An architect …

  3. Agenda • Review of Area of Irregular Figures • Review Study Guide • Practice with finding area

  4. Area of Irregular Figures • Don’t assume anything!

  5. Study Guide • About 16 in2 • About 10 in2 • A = (9)(12) = 108 cm2 • A = ½ (16)(24) = 192 in2 • A = ½ (7.5)(5+10) = 56.25 m2 • A = triangle + square = ½ (8)(12) + (12)2 = 48 + 144 = 192 cm2

  6. Study Guide 7. C = 2πr = 2(3.14)(4) = 25.12 cm A = πr2 = (3.14)(4)2 = 50.24 cm2 8. d = 2r = 25 mm r = 12.5 mm C = 2πr = 2(3.14)(12.5) = 78.5 mm A = πr2 = (3.14)(12.5)2 = 490.625 mm2

  7. Cold Call! How do you find the area? Keep your study guide out!

  8. What is pi (π)?

  9. Additional Practice • What did the scientist say to the hydrogen atom that claimed to have lost an electron? • What happened when the TV set asked the remote control for a date? • Answers will be posted at www.teachervivian.com

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