ETC Montessori Elementary I Curriculum

Geometry Nomenclature

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This complete geometry nomenclature is used in lower elementary and reviewed in upper elementary describing the parts and types of lines, angles, triangles, quadrilaterals, polygons and circles. Each geometric concept is color coded based on the traditional Montessori geometry concepts. 


  • over 520 pictures
  • all the necessary booklets, and
  • all the control charts

Control charts included for the following concepts that correspond to the booklets:

  • Point to Solid
  • Lines
  • Types of Lines
  • Parts of a Line & Ray
  • Relationship of Line to a Plane
  • Relationship Between two Lines
  • Axis of a Line Segment
  • Angle
  • Principle Angles
  • Parts of an Angle
  • Relationship Between Two Angles
  • Combinations of Angles
  • Parallel Lines and Two Angle Relationships
  • Angle Bisector
  • Parts of a Triangle
  • Sides of a Right Angled Triangle
  • Types of Right Angled Triangles
  • Triangles Classified by Sides
  • Triangles Classified by Angles
  • Closed Curved Regions
  • Plane Figures
  • Relationship of a Straight Line to a Circle
  • Relative Positions between Circles
  • Irregular and Regular Polygons
  • Polygons
  • Parts of a Polygon
  • Regular Polygons
  • Types of Quadrilaterals
  • Parts of a Basic Parallelogram
  • Parts of a Rectangle
  • Parts of a Rhombus
  • Parts of a Kite
  • Parts of a Square
  • Parts of a Trapezoid
  • Types of Trapezoids
  • Parts of a Circle
Take a look at our Geometry Flow Chart for Lower Elementary to see how this work fits in with the traditional Montessori geometry curriculum
1 Set of Plastic Sleeve Holders (will utilize 20) based on a rotational model

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