Geometric cabinet and insets

MATERIALS
A wooden cabinet with 6 drawers and a presentation tray. Each drawer and the tray contain 6 wooden divisions. In most of the divisions, there is a wooden inset with a knob to lift it out. The inset and the bottom of the drawer are painted the same color blue. The square frames of the insets are a contrasting wood color and are removable. In the presentation tray as, in some drawers where there are not 6 insets, the remaining square divisions are whole.

Drawer 1
Contains 6 circles increasing in diameter from 5cm to 10cm.

Drawer 2
Contains 1 square and 5 rectangles, the bases vary from 10cm to 5cm, while the height remains the same.

Drawer 3
Contains 6 triangles: equilateral, acute-angled isosceles, right-angled isosceles, obtuse-angled isosceles, right-angled scalene, obtuse-angled scalene.

Drawer 4
Contains 6 regular polygons: pentagon, hexagon, heptagon, octagon, nonagon, and decagon.

Drawer 5
Contains 4 quadrilaterals: rhombus, parallelogram, right-angled trapezoid, isosceles trapezoid, and 1 triangle – acute-angled scalene.

Drawer 6
Contains curved figures: curvilinear triangle, ellipse, oval, and quatrefoil.

LANGUAGE

Quadrilaterals rectangle, square, rhombus, parallelogram, trapezoid, right-angled trapezoid

Curved Figures circle, oval, ellipse, quatrefoil, curvilinear triangle.

Triangles equilateral, right-angled isosceles, acute-angled isosceles, obtuse-angled isosceles, right-angled scalene, acute-angled scalene, obtuse-angled scalene.

Polygons pentagon, hexagon, heptagon, octagon, nonagon, decagon.

PREPARATION
– Using right thumb and index finger, pinch the knob of the insets and lift it out slowly
– Gently place it in the middle of the empty wooden space above.
– Do this activity with remaining insets
– Trace the shapes on a paper
– Gently replace the insets into its inset.
– Repeat in the same manner for the remaining apparatus.
Offer the child to do the lesson.
Show the child how to change out the insets with other shapes from the Geometric Cabinet.
PURPOSE

Direct
Discrimination of form, to provide the child with the key to orient himself in the world of shapes.

Indirect
Preparation for mathematics: geometry.
Preparation of the hand for writing.