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Transparency 5

Transparency 5. Click the mouse button or press the Space Bar to display the answers. Splash Screen. Example 5-3c. Objective. Find the area of triangles and trapezoids. Example 5-3c. Vocabulary. Trapezoid. A quadrilateral with one pair of parallel sides. Lesson 5 Contents.

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Transparency 5

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  1. Transparency 5 Click the mouse button or press the Space Bar to display the answers.

  2. Splash Screen

  3. Example 5-3c Objective Find the area of triangles and trapezoids

  4. Example 5-3c Vocabulary Trapezoid A quadrilateral with one pair of parallel sides

  5. Lesson 5 Contents Example 1Find the Area of a Triangle Example 2Find the Area of a Trapezoid Example 3Use a Formula to Estimate Area

  6. Example 5-1a Find the area of the triangle Write formula for area of triangle (9 cm) (3.2 cm) Replace b (for base) with 9 cm Replace h (height) with 3.2 cm 1/3

  7. Example 5-1a Find the area of the triangle Multiply numbers (9 cm) (3.2 cm) Multiply units Answer: cm2 A = 14.4 1/3

  8. Example 5-1c Find the area of the triangle Answer: A = 13.5 ft2 1/3

  9. Example 5-2a Find the area of the trapezoid (3 m) (7.6 m + 4 m) Write the formula for area of a trapezoid Replace h (for height) with 3 m Replace b1 (for base) with 7.6 m Replace b2 (for base) with 4 m 2/3

  10. Example 5-2a Find the area of the trapezoid Follow Order of Operations P E MD AS (3 m) (7.6 m + 4 m) (3 m) (11.6 m) Multiply numbers Answer: Multiply units meters2 A = 17.5 2/3

  11. Example 5-2c Find the area of the trapezoid Answer: A = 61.5 cm2 2/3

  12. Example 5-3a GEOGRAPHYThe shape of the state of Montana resembles a trapezoid. Estimate its area in square miles. Write the formula for area of a trapezoid + 542 mi) (285 mi) (479 mi Replace h (for height) with 285 mi Replace b1 (for base) with 479 mi Replace b2 (for base) with 542 mi 3/3

  13. Example 5-3a GEOGRAPHYThe shape of the state of Montana resembles a trapezoid. Estimate its area in square miles. Follow Order of Operations P E MD AS (285 mi) (479 mi + 542 mi) Multiply numbers (285 mi) (1,021 mi) Multiply units Answer: A = 145.492.5 miles2 3/3

  14. Example 5-3c PAINTINGThe diagram below is of a canvas resembling a trapezoid that will be painted. In order to determine how much paint will be needed, estimate the area of the canvas in square feet. Answer: A = 150 ft2 3/3

  15. End of Lesson 5 Assignment

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