 Visual Geometry Dictionary
for Kids and for Kids' Teachers

Clicking one of the terms below will access a visual display showing one or more individuals' way of understanding the term. We hope you will enjoy seeing our creative ways for making sense of geometry words.

This geometry dictionary is an ongoing project developed by the students at Oklahoma State University in the course MATH 3403 Geometric Structures, a course for prospective elementary teachers.

Lines and Segments:

Angles:

Triangles:

 3-4-5 Triangle 30-60-90 Triangle 45-45-90 Triangle Acute Triangle Altitude Balance Point Circumcenter & Circumscribed Circle Equilateral Triangle Incenter & Inscribed Circle Inscribed Triangle Isosceles Right Triangle Isosceles Triangle Median Obtuse Triangle Perpendicular Bisector of Side Right Triangle, Hypotenuse, & Leg Scalene Triangle

 Adjacent Angles Adjacent Sides Cyclic Quadrilateral Diagonals Diagonals Bisecting Angles Diamond Inscribed Quadrilateral Isosceles Trapezoid Kite Line of Symmetry Mutually Bisecting Diagonals Opposite Angles Opposite Sides Parallelogram Perpendicular Diagonals Quadrilateral Rectangle Rhombus Square Trapezoid

Polygons:

 Convex or Concave Decagon Diagonal Dodecagon Heptagon Hexagon Inscribed Polygon N-gon Nonagon Octagon Pentagon Perimeter Regular Polygon Simple Polygon Vertex

Circles:

 arc, major & minor Center, Diameter, & Radius Chord Sector semi-circle tangent line

Folding or Reflecting:

 Corresponding Points & Lines Hamburger & Hotdog Fold Image Line of Symmetry Reflection

Other Terms:

 Coincident Congruent Similar Simple Closed Curve Sphere

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