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

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An architect …

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

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Area of Irregular Figures Don’t assume anything!

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Study Guide 1.About 16 in 2 2.About 10 in 2 3.A = (9)(12) = 108 cm 2 4.A = ½ (16)(24) = 192 in 2 5.A = ½ (7.5)(5+10) = 56.25 m 2 6.A = triangle + square = ½ (8)(12) + (12) 2 = 48 + 144 = 192 cm 2

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

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

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What is pi (π)?

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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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