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# Geometry terms DOC

### Geometry Terms

Question | Answer |
---|---|

A triangle in which all three angles are acute | acute triangle |

A figure formed by two rays that have a common endpoint | Angle |

A line segment with its endpoints on a circle | Chord |

A closed plane figure with all points on the figure the same distance from the center | Circle |

The distance around a circle | Circumference |

A figure that begins and ends at the same point | Closed figure |

A solid figure that has a circular base and one vertex | Cone |

Having the same size and shape | Congruent |

Figures that have the same size and shape | Congruent figures |

A plane formed by two intersecting and perpendicular number lines called axes | Coordinate plane |

The numbers in an ordered pair | Coordinates |

A solid figure with six congruent square faces | Cube |

A solid figure that has two parallel bases that are congruent circles | Cylinder |

A unit for measuring angles and temperature | Degree (°) |

A line segment that passes through the center of a circle and has its endpoints on the circle | Diameter |

A measure in one direction; the length, width, or height of a figure | Dimension |

The line segment where two faces of a solid figure meet | Edge |

A triangle with three congruent sides | Equilateral triangle |

A polygon that is a flat surface of a solid figure | Face |

Numbers that can be represented by geometric figures | Figurate numbers |

A polygon with six sides and six angles | Hexagon |

In a right triangle, the side opposite the right angle; the longest side in a right triangle | Hypotenuse |

Lines that cross at exactly one point | Intersecting lines |

A triangle with two congruent sides | Isosceles triangle |

A straight path in a plane that goes on forever in opposite directions | Line |

A part of a line that includes two points, called endpoints, and all of the points between them | Line segment |

A figure has line symmetry if a line can separate the figure into two congruent parts | Line symmetry |

A triangle that has one obtuse angle | Obtuse triangle |

A polygon with eight sides | Octagon |

A pair of numbers used to locate a point on a coordinate plane; the first number tells how far to move horizontally and the second number tells how far to move vertically | Ordered pair |

Lines in a plane that never intersect | Parallel lines |

A quadrilateral whose opposite sides are parallel and congruent | Parallelogram |

A polygon with five sides | Pentagon |

Two lines that intersect to form four right angles | Perpendicular lines |

The ratio of the circumference of a circle to its diameter | pi |

A flat surface that extends without end in all directions | Plane |

A figure which lies in a plane | Plane figure |

An exact location in space, usually represented by a dot | Point |

When a figure can be turned half way about a central point and still look the same | Point symmetry |

A closed plane figure formed by three or more line segments | Polygon |

A solid figure with flat faces that are polygons | Polyhedron |

A solid figure that has two congruent, polygon-shaped bases, and other faces that are all rectangles | Prism |

A tool used for measuring or drawing angles | Protractor |

A solid figure with a polygon base and all other faces triangles that meet at a common vertex | Pyramid |

A polygon with four sides | Quadrilateral |

Created by:
17rcombs