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Understanding Areas of Triangles and Polygons: Chapter 9 Review and Practice

This chapter review focuses on the concepts of area for triangles and regular polygons, covering essential formulas such as Area of Triangle (A = ½ * b * h) and Area of Regular Polygons (A = ½ * ap). Students will practice these concepts through guided warm-up exercises and a focused review of previous sections on sine, cosine, and tangent functions. This resource is designed to enhance understanding and prepare for the upcoming test, encouraging familiarity with area calculations and trigonometric functions relevant to real-world applications.

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Understanding Areas of Triangles and Polygons: Chapter 9 Review and Practice

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  1. Section 9-5 (cont’d) Chapter 9 Test Review April 19, 2012

  2. Warm-up (10 mins) Practice Book: Practice 9-5, # 1 – 21 (odd)

  3. Warm-up (10 mins)

  4. Warm-up (10 mins)

  5. Questions on Homework?

  6. Area of Triangles Area of Triangle = ½ b*h

  7. Area of Triangles

  8. Area of Triangles: Examples 1. Find area of this triangle to the nearest hundredth

  9. Area of Triangles: Examples Find area of these triangles to nearest tenth: 1. 2. 3.

  10. Area of Parallelograms

  11. Area of Parallelograms: Examples Find area of this parallelogram to the nearest hundredth

  12. Area of Regular Polygons Area = ½ ap Use trigonometry to find a:

  13. Area of Regular Polygons: Examples Find area of these regular polygons to nearest tenth: 1. 2. A dodecagon with perimeter = 108

  14. Chapter 9 Review • Sections 9-1/9-2: Sine/Cosine/Tangent and Inverse Functions • Section 9-3: Angles of Elevation and Depression • Section 9-5: Area of Regular Polygons and Triangles

  15. Chapter 9 Review Use Inverse Function to find angles

  16. SOH CAH TOAisms – 1B • Seven Otters Happily Canter About Hunting Together On Alderaan. • Shots Of Heroine Can Alter Hippies’ Thoughts Of Apples. • Six Orange Hippos Caught A Holy Turtle On Appalachian. • Some Old Hairy Cat Aggravates Her Teacher On Airplanes. • Some Old Hag Came After Hannah Then Overcame Anna. • Selena Of Houston Can Arrange Her Trees Orderly Anytime. • Some Old House Cats Always Hunger Tacos Or Apples • Sally Oliver Has Cattle And Horses To Offer Ashley

  17. SOH CAH TOAisms – 2B • Soon Orange Hamsters Can Allow Henry To Oscillate Apples • So One Happy Cat Arrived Here To Open Anchovies • Someone On Her Class Allowed Her To Organize Assignments • Some Old Hag Capped All Heroin Traders Of America • Some Old Hippie Caught A Happy Tiger On Acid • Soft Or Hard Cats Are Huggable Tacos Or Ancelatas • Students Of Harvard Call And Hassel The Old Assistant • Son Of Hippie Chats About Hippies To Open Advice

  18. SOH CAH TOAisms – 4B • Silly Obsessed Hippos Come Awkwardly Here To Orangehill Alabama • Some One Had Cancer And He Took Over America • Soaking Octopuses Hide Cannot Allow Humans To Open Access • Sarah Openly Hoarded Cantaloupes And Had Two Old Apples • Some Old Horse Came After Hannah’s Thing Of Apples • Seeking Out Help Can Assist Him Tremendously On Assignments • Some Old Hippies Can Always Have Tests On Algebra • Some Old Hag Cracked All Her Teeth On Apples

  19. Chapter 9 Review • Angles of Elevation and Depression • Area of Regular Polygon = ½ ap • Area of Triangle = ½ bc(sin A)

  20. Wrap-up Test tomorrow! Homework/Test Review • p. 505, # 2-4, 8-25, 40-46 • p. 508, # 9-15, 17, 26-29

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