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# Ch. 9 Vocabulary

### Pre-Algebra - Ch. 9

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

Point | a location in space that has no size |

line | a series of points that extends in opposite directions without end |

Plane | a flat surface with no thickness and extends without end in all directions |

Line segment | a part of a line that has two endpoints |

ray | a part of a line that has exactly one endpoint and extends without end in one direction |

parallel lines | two lines that lie in the same plane and do not intersect |

skew lines | lines that do not lie in the same plane, are not parallel and do not intersect |

Adjacent angles | angles that share a vertex and a side but no points in their interiors |

vertical angles | angles that are formed by two intersecting lines and are opposite each other. |

Congruent angles | angles that have the same measure |

Supplementary angles | angles whose sum is 180 degrees |

Complementary angles | angles whose sum is 90 degrees |

Transversal | a lines that intersects two other lines in different points |

Corresponding angles | lie on the same side of the transversal in corresponding positions |

alternate interior angles | angles in the interior of a pair of lines and on opposite sides of the transversal |

polygon | a closed plane figure with at least three sides |

acute triangle | triangle with three acute angles |

right triangle | triangle with one right angle |

obtuse triangle | triangle with one obtuse angle |

equilateral triangle | triangle with three congruent sides |

isosceles triangle | triangle with at least two congruent sides |

scalene triangle | triangle with no congruent sides |

quadrilateral | polygon with 4 sides |

trapezoid | a quadrilateral with exactly one pair of parallel sides |

parallelogram | quadrilateral with both pairs of opposite sides parallel |

rectangle | a parallelogram with four 90 degree angles |

square | a rectangle with four congruent sides |

rhombus | a parallelogram with four congruent sides |

regular polygon | a polygon where all sides and angles are congruent |

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

central angle | an angle whose vertex is the center of a circle |

radius | a segment that has one endpoint at the center and the other endpoint on the circle |

diameter | a chord that passes through the center of a circle |

circumference | distance around a circle |

chord | a segment whose endpoints are on the circle |

congruent figures | figures that have the same shape and size, and their corresponding parts have equal measures |

congruent angles | Angles that have the same measure |

Acute angle | An angle with a measure less than 90 degrees |

angle of rotation | the angle measure of the rotation |

center of rotation | the fixed point which a figure rotates around |

decagon | a figure with 10 sides |

diagonal | a segment that connects two nonconsecutive vertices |

heptagon | a seven sided figure |

hexagon | a six sided figure |

image | the result of the transformation of a point, line, or figure to a new set of coordinates |

line of reflection | a line across which a figure is reflected |

line of symmetry | a line that divides a figure with rotational symmetry into 2 congruent halves |

nonagon | a nine sided figure |

obtuse angle | an angle with a measure of more than 90 degrees but less than 180 degrees |

octagon | an eight sided figure |

pentagon | a five sided figure |

perpendicular lines | lines that intersect and from a 90 degree angle |

reflection | a transformation that flips a figure over a line of reflection |

reflectional symmetry | when one half of a figure is a mirror image of the other half |

right angle | an angle that measures 90 degrees |

rotation | a transformation that turns a figure about a fixed point |

rotational symmetry | when the figure can be rotated 180 degrees or less and match the original figure |

straight angle | an angle with a measure of 180 degrees |

transformation | a change of position or size of a figure |

translation | a transformation that moves points the same distance and in the same direction |

triangle | a three sided figure |

Created by:
unverferth