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# Friday, January 6, 2012 - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about ' Friday, January 6, 2012' - callie

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Presentation Transcript

• No HW.

• Study for Ch. 7 on Wed 1/11

• Warm Up –

Complete #20 on

back of HW –

“An architect …”

• Review of Area of Irregular Figures

• Review Study Guide

• Practice with finding area

• Don’t assume anything!

• 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

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!

How do you find the area?