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Constructive Triangles  Rectangular Box A 

Purpose:
 To show the quadrilateral figures formed by various triangles.
 To discriminate geometric forms.
 To develop growth in concentration and independence.
Age:
4.5 years old.
Material:
 Two yellow equilateral triangles, black lines on one side. When the two lines are mapped, a rhombus is formed.
 Two yellow rightangled isosceles triangles with a black line painted on one side.
 When the black lines are mapped, a parallelogram is formed.
 Two green rightangled isosceles triangles with a black line on the hypotenuse of each triangle (the line opposite the right angle). When the two black lines are mapped, a square is formed.
 Two yellow rightangled scalene triangles with black lines drawn on one side. When the two lines are mapped, an oblique parallelogram is formed.
 Two green rightangled scalene triangles equal to the yellow scalene rightangled triangles; black lines drawn on one side. When the black lines are mapped, a parallelogram is formed.
 Two gray rightangled scalene triangles, the same size as the yellow and green; black lines painted on the hypotenuse. When the black lines are mapped, a rectangle is formed.
 One red rightangled scalene triangle; black lines on one side.
 One red obtuseangled isosceles triangle; black line on one side. When the black lines of the red triangles are mapped, a trapezoid is formed.

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Presentation  Isosceles right triangles: 






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