Metal Triangles
The Metal Triangles set features four finely made triangular metal insets within green square frames, designed for advanced geometry work in the elementary classroom. Each triangle represents a different type (equilateral, isosceles, right-angled, and scalene), so that children explore geometric properties through tracing, comparing, and constructing various geometric figures.
“The senses, being explorers of the world, open the way to knowledge.”— Maria MontessoriThe Discovery of the Child
The Metal Triangles introduce elementary children to precise geometric classification through direct manipulation of four distinct triangle types. Each metal inset—equilateral, isosceles, right-angled, and scalene—provides exact mathematical relationships that children discover through tracing and comparison. The green square frames create consistent boundaries while the metal forms offer durability for repeated geometric explorations. These triangles bridge sensorial experiences with abstract mathematical concepts, as children physically trace each metal shape to internalize angle relationships and side proportions. The precision-crafted metal ensures accurate representations of geometric principles, allowing children to discover that the equilateral triangle has three equal sides, the isosceles has two, and the scalene has none. Through manipulating these metal insets, children build foundations for advanced geometry work including angle measurement, triangle construction, and proof development.
Step by Step to Mastery
Use three-period lesson for vocabulary
'This is equilateral'
Hold the frame firmly with non-dominant hand while tracing
Encourage comparing traced shapes to notice similarities and differences
Guide discovery that equilateral has three equal sides
Show how triangles can tessellate or form hexagons
Use three-period lesson for vocabulary
'This is equilateral'
Hold the frame firmly with non-dominant hand while tracing
Encourage comparing traced shapes to notice similarities and differences
Guide discovery that equilateral has three equal sides
Show how triangles can tessellate or form hexagons
Every Child Is a Little Creator
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Since 1929
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in Europe
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