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:

Parallel Lines | Perpendicular Lines | Perpendicular Bisector | Segment Bisector |

Angles:

Acute Angle | Alternate Interior Angles | Angle Bisector | Complementary Angles |

Congruent Angles | Corresponding Angles | Obtuse Angle | Reflex Angle |

Right Angle | Supplementary Angles | Vertical Angles |

Triangles:

Quadrilaterals:

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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