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# Ch. 7 Vocabulary

### Math 7 - Ch. 7

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

Circle | The set of all points in a plane that are the same distance from a given point |

Skew Lines | Lines that lie in different planes that are neither parallel nor intersecting |

Line | A straight path that extends without end in opposite directions |

Plane | A flat surface that extends forever |

Arc | A part of a circle named by its endpoints |

Vertex | The point where two sides intersect |

Perpendicular Lines | Line the intersect to form right angles |

Ray | A part of a line that starts at one endpoint and extends forever |

Acute angle | An angle that measure less than 90 degrees |

Radius | Line segment with one endpoint at the center of a circle, the other endpoint on the circle |

Congruent | Having the same size and shape |

Line Segment | A part of a line between two endpoints |

Complementary Angles | Two angles whose measures add to 90 degrees |

Straight Angle | An angle that measure 180 degrees |

Sector | A region enclosed by two radii and the arc joining their endpoints |

Angle | A figure formed by 2 rays witha common endpoint |

Vertical Angles | A pair of opposite congruent angles formed by intersecting lines |

Obtuse Angle | An angle whose measure is great than 90 degrees but less than 180 degrees |

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

Point | An exact location in space |

Supplementary Angles | Two angles whose measures have a sum of 180 degrees |

Center of a Circle | The point inside a circle that is the same distance from all points on the circle |

Right Angle | An angle that measures 90 degrees |

Parallel Lines | Lines in a plane that do not intersect |

Chord | A line segment with endpoints on a circle |

Transversal | A line that intersects two or more lines |

Central Angle | An angle with its vertex at the center of a circle |

Polygon | A closed figure formed by 3 or more line segments |

Side | A line bounding a geometric figure |

vertex of a polygon | The point where 2 sides of a polygon intersect |

Regular Polygon | A polygon with congruent sides and angles |

Scalene Triangle | A triangle with no congruent sides |

Isosceles Triangle | A triangle with at least two congruent sides |

Equilateral Triangle | A triangle with three congruent sides |

Acute Triangle | A triangle with all three angles measuring less than 90 degrees |

Obtuse Triangle | A triangle containing one obtuse angle |

Right triangle | A triangle containing a right angle |

Parallelogram | A quadrilateral with 2 pairs of parallel sides |

Rhombus | A parallelogram with all sides congruent |

Rectangle | A parallelogram with 4 right angles |

Square | A rectangle with 4 congruent sides |

Trapezoid | A quadrilateral with exactly one pair of parallel sides |

Kite | A quadrilateral with 2 pairs of adjacent congruent sides |

Diagonal | A line segment that connects two non-adjacent vertices of a polygon |

Side-side-side Rule | A rule stating that is three sides of one triangle are congruent to three sides of another triangle, the triangles are congruent |

Transformation | A change in size or position of a figure |

Image | A figure resulting from a transformation |

Translation | A movement (slide) of a figure along a straight line |

Rotation | A transformation in which the figure is turned around a point |

Reflection | A transformation of a figure that flips the figure across a line |

Line of Reflection | A line that a figure is flipped across to create a mirror image of the original figure |

Line Symmetry | One-half of a figure is a mirror-image of the other half |

Line of Symmetry | The imaginary "mirror" in line symmetry |

Asymmetry | Not identical on either side of a central line; not symmetrical |

Rotational Symmetry | A figure has rotational symmetry if it can be rotated less than 360 degrees around a central point and coincide with the original figure |

Center of Rotation | The point about which a figure is rotated |

Created by:
unverferth