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# Geometry Term

### geomtry terms

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

Acute triangle | A triangle in which all three angles are acute Examples: |

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

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

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

Circumference | The distance around a circle Example: |

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

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

Congruent | Having the same size and shape Example: The triangles are congruent. |

Congruent figures | Figures that have the same size and shape Example: The triangles are congruent. |

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

Coordinates | The numbers in an ordered pair Example: |

Cube | A solid figure with six congruent square faces Examples: |

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

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

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

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

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

Equilateral triangle | A triangle with three congruent sides Example: |

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

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

Hexagon | A polygon with six sides and six angles Examples: |

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

Intersecting lines | Lines that cross at exactly one point Example: Line EF intersects line GH. |

Isosceles triangle | A triangle with two congruent sides Example: |

Line | A straight path in a plane that goes on forever in opposite directions Example: line AB or line BA |

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

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

Obtuse angle | An angle whose measure is greater than 90° and less than 180° Example: |

Obtuse triangle | A triangle that has one obtuse angle Example: |

Octagon | A polygon with eight sides Examples: |

Ordered pair | A pair of numbersthe first number tells how far to move horizontally and the second number tells how far to move vertically |

Parallel lines | Lines in a plane that never intersect Example: |

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

Pentagon | A polygon with five sides Examples: |

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

pi (Noun) | The ratio of the circumference of a circle to its diameter An approximate decimal value of pi is 3.14. |

Plane | A flat surface that extends without end in all directions Example: Planes are named by three points in the plane. |

Plane figure | A figure which lies in a plane Examples: |

Point | An exact location in space, usually represented by a dot Example: point A |

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

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

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

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

Protractor | A tool used for measuring or drawing angles Example: |

Pyramid | A solid figure with a polygon base and all other faces triangles that meet at a common vertex Example: This is a square pyramid |

Quadrilateral | A polygon with four sides |

Radius | A line segment with one endpoint at the center of a circle and the other endpoint on the circle Example: radius |

Ray | A part of a line, with one endpoint, that continues without end in one direction Example: ray CD |

Rectangle | A parallelogram with four right angles |

Created by:
17sncollins