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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!.

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Friday, January 6, 2012

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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

An architect …


Agenda

Agenda

  • Review of Area of Irregular Figures

  • Review Study Guide

  • Practice with finding area


Area of irregular figures

Area of Irregular Figures

  • Don’t assume anything!


Study guide

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


Study guide1

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


Cold call

Cold Call!

How do you find the area?

Keep your study guide out!


What is pi

What is pi (π)?


Additional practice

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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