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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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Minds On - Trapezoid In your math notebook – Draw a picture of a trapezoid. Name two characteristics of a trapezoid
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.
Review of Shapes • Triangle A = ½ b × h • Parallelogram A = b × h
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
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?
Label the trapezoid . b1 h b2
Area of two trapezoids (similar shape?) b1 b2 h b2 b1 A = h × (b1 + b2)
Area of a trapezoid . b1 h b2 A = h × (b1 + b2) ÷ 2
Home Activity • Text book page 165 ; Questions #9, #10, #14
Ticket out the door Please complete and hand to teacher