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Area of a Trapezoid

Area of a Trapezoid. Minds On - Trapezoid. In your math notebook – Draw a picture of a trapezoid. Name two characteristics of a trapezoid. Definition of a Trapezoid.

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Area of a Trapezoid

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  1. Area of a Trapezoid

  2. Minds On - Trapezoid In your math notebook – Draw a picture of a trapezoid. Name two characteristics of a trapezoid

  3. Definition of a Trapezoid • A four sided shape with two parallel sides having the appearance of a triangle with a flattened top • A square with the top narrower than the bottom • A quadrilateral with exactly one pair of parallel sides. The parallel sides are the bases and the nonparallel sides are the legs. • It has 4 corners. It has 4 sides. The diagonal sides are the same length. The sides on the top and bottom are a different length.

  4. Picture of a Trapezoid

  5. Review of Shapes • Triangle A = ½ b × h • Parallelogram A = b × h

  6. Group Work • Wait until the teacher says ‘go’ • Divide yourself into groups of three • When teacher says ‘go’ move to a table with your group • Shortest person obtain a ruler and scissors for each group • Person with the ‘brightest’ top on be the recorder

  7. Calculate Area • Using the triangle sheet , construct a parallelogram and calculate area (using scissors and ruler). • Using the trapezoid sheet see if you can calculate the area of this shape (using scissors and ruler). • What is the formula ? • Can you show the area for the trapezoid in two different ways?

  8. Label the trapezoid . b1 h b2

  9. Area of two trapezoids (similar shape?) b1 b2 h b2 b1 A = h × (b1 + b2)

  10. Area of a trapezoid . b1 h b2 A = h × (b1 + b2) ÷ 2

  11. Home Activity • Text book page 165 ; Questions #9, #10, #14

  12. Ticket out the door Please complete and hand to teacher

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