Mary Koerber Geometry in two dimensional and three dimensional ...
Mary Koerber Geometry in two dimensional and three dimensional ...
Mary Koerber Geometry in two dimensional and three dimensional ...
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Open<strong>in</strong>g Activity (day 3)Go over f<strong>in</strong>d<strong>in</strong>g the area of a trapezoid.Example:24.3 cm8.5cmArea: 144.5 cm 29.7cmH<strong>and</strong> out different sized triangles, squares, rectangles, pentagons, hexagons, <strong>and</strong>octagons to each group. Have each group discuss how they can f<strong>in</strong>d the area of theseshapes without know<strong>in</strong>g a formula for these specific shapes.Students should come up with that the area can be found by add<strong>in</strong>g up the area of alreadyknown shapes that fit <strong>in</strong>side the new shape.Koeber – Page 16
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