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# WLE Geometry Unit 10

### 2 and 3 dimensional shapes

Term | Definition |
---|---|

Base of a cone | the flat surface shaped like a circle |

Base of a pyramid | a face opposite the common vertex (apex) where the triangular faces meet |

Bases of a cylinder | the two congruent, opposite flat surfaces shaped like circles |

Bases of a prism | the two congruent, opposite faces that are connected by rectangular faces |

Classify | applying an attribute to categorize a sorted group |

Congruent | of equal measure. |

Congruent figures | figures that are the same size and same shape |

Decompose figures | to break a geometric figure into two or more smaller geometric figures |

Edge | where the sides of two faces meet on a three dimensional figure |

Face of a prism | a polygon that forms a surface of a prism |

Irregular figure | a polygon with sides and/or corners that are not all congruent |

Polygon | a closed figure with at least 3 sides, where all sides are straight (no curves) |

Properties of three-dimensional figures | relationship of attributes within a geometric figure (e.g., a rectangular prism has 6 faces and each pair of opposite faces (bases) are congruent, etc.) and between a group of geometric figures (e.g., a square and a rectangle both have 4 sides and 4 square corners; however, a square has 4 congruent sides but a rectangle has only opposite sides congruent; etc.) |

Quadrilateral | a polygon with 4 sides and 4 vertices |

Regular figure | a polygon with all sides and corners congruent |

Side | a straight outer boundary between two vertices (line segment) of a two-dimensional figure |

Sort | grouping objects or figures by a shared characteristic or attribute |

Three-dimensional figure | a figure that has measurements including length, width (depth), and height |

Two-dimensional figure | a figure with two basic units of measure, usually length and width. |

Unit fraction | a fraction in the form of 1/b representing the quantity formed by one part of a whole that has been partitioned into b equal parts where b is a non-zero whole number. |

Vertez (vertices) in a three dimensional figure | the point where three or more edges of a three- dimensional figure meet |

Vertex (vertices) in a two-dimensional figure | the point (corner where two sides of a two-dimensional figure meet |