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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 right-angled isosceles triangles with a black line painted on one side.
  • When the black lines are mapped, a parallelogram is formed.
  • Two green right-angled 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 right-angled scalene triangles with black lines drawn on one side. When the two lines are mapped, an oblique parallelogram is formed.
  • Two green right-angled scalene triangles equal to the yellow scalene right-angled triangles; black lines drawn on one side. When the black lines are mapped, a parallelogram is formed.
  • Two gray right-angled 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 right-angled scalene triangle; black lines on one side.
  • One red obtuse-angled 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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