# 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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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!

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

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

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

What is pi (π)?

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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