When the child has built all the triangles as in the First Presentation, say: “Today I am going to do something special with the triangles.”
Starting with the gray, then green, yellow and red, build the figure shown below and say: “I made a great big triangle.” Trace starting from the lower left corner going counter clockwise.
Take it apart, place it in its proper position and offer the child a turn.
Return them to their place on the rug. Then replace them back into the box, the box to the shelf.
POINTS OF INTEREST
Tracing the black lines.
Matching the triangles.
Superimposing the gray triangle.
Making the one big triangle.
Indirect superimposing when putting them back in the box.
Naming the shapes and the various triangles used to make them.
CONTROL OF ERROR
Black guides.
Different colors of triangles.
DIRECT AIMS
Showing that different sets of triangles, when put together, are equal in size to the gray triangle.
Development of the ability to discriminate geometric forms.
Growth in concentration and independence.
INDIRECT AIMS
Preparation for Geometry.
Development of appreciation of line and form.
Development of creativity.
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