friday, january 6, 2012 no hw. study for ch. 7 on wed 1/11 warm up – complete #20 on back of hw...
TRANSCRIPT
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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 in2
2. About 10 in2
3. A = (9)(12) = 108 cm2
4. A = ½ (16)(24) = 192 in2
5. A = ½ (7.5)(5+10) = 56.25 m2
6. A = triangle + square= ½ (8)(12) + (12)2
= 48 + 144 = 192 cm2
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Study Guide
7. C = 2πr = 2(3.14)(4) = 25.12 cmA = πr2 = (3.14)(4)2 = 50.24 cm2
8. d = 2r = 25 mmr = 12.5 mmC = 2πr = 2(3.14)(12.5) = 78.5 mmA = πr2 = (3.14)(12.5)2 = 490.625 mm2
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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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