The Montessori Geometric Cabinet is a part of the Montessori sensorial curriculum, that is used to teach children about the two-dimensional, or plane, shapes. Prior to the cabinet being introduced, the child explores the Intro Tray, which has a circle, square, and rectangle. Each subsequent tray goes more in depth.
The circle tray is the first one presented in the Montessori Geometric Cabinet. Children trace the contours of the circles, to feel the round shape. Six circles are in the tray, ranging in order from largest to smallest in diameter.
The rectangle tray is the second tray in the Montessori Geometric Cabinet. Six rectangles are in the tray. The largest is the square, which is a special rectangle. The remaining rectangles get smaller in width.
The triangle tray is the third tray in the Montessori Geometric Cabinet. It consists of six triangles. Their names are equilateral triangle, acute isosceles triangle, right isosceles triangle, obtuse isosceles triangle, right scalene triangle, and obtuse scalene triangle.
The fourth tray in the Montessori Geometric Cabinet is the polygon tray. Shapes in this tray include the pentagon, hexagon, heptagon, octagon, nonagon, and decagon.
The last two trays consist of irregular shapes. In the fifth tray, which are the irregular straight shapes, there are rhombus, parallelogram, acute scalene triangle, trapezoid, and right trapezoid. In the irregular curved shapes tray, there are oval, ellipse, curvilateral triangle, and quatrefoil.
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