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# Math Chapter 5 Terms

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

a length made up of points that extends indefinitely in both directions | line |

a portion of a line having 2 endpoints | line segment |

a portion of a line having one endpoint and extending infinitely in one direction from the endpoint | ray |

formed by 2 rays that share a common endpoint called a vertex | angle |

2 lines that cross at a point | intersecting lines |

lines that never intersect | parallel lines |

an exact location in space | point |

intersecting lines that form 4 right angles | perpendicular lines |

figures that consist of curved lines or straight lines that lie on a flat surface | plane figure |

plane figures that begin and end at the same point | closed figures |

a closed figure made of only straight lines and no curves | polygon |

the point where 2 sides meet | vertex |

4 sides | quadrilateral |

5 sides | pentagon |

6 sides | hexagon |

7 sides | heptagon |

8 sides | octogon |

9 sides | nonagon |

10 sides | decagon |

any four sided polygon | quadrilateral |

any quadrilateral that has only one set of opposite sides parallel | trapezoid |

any quadrilateral that has both sets of opposite sides parallel | parallelogram |

any parallelogram that has all sides equal | rhombus |

any parallelogram that has four right angels | rectangle |

any rectangle that has all sides equal | square |

a polygon with all sides equal | equilateral polygon |

a polygon with all angles equal | equiangular polygon |

a polygon with all sides equal and all angles equal | regular polygon |

polygons that have the exact same shape and size/all corresponding sides must be equal and all corresponding angles must be equal | congruent |

parts of the polygon that are in matching positions | corresponding parts |

three sides of one triangle are equal to their corresponding sides in a second triangle | SSS (side side side) |

two sides and the included angle of one triangle are equal to their corresponding parts in a second triangle | SAS (side angle side) |

two angles and the included side of one triangle are equal to their corresponding parts in a second triangle | ASA (angle side angle) |

polygons with same shape but different sizes, all corresponding angles are equal, corresponding sides must be proportional | similar |

ratio of corresponding sides between similar polygons | ratio of similitude |

two angles of one triangle are equal to two corresponding angles of a second triangle | AA (angle angle) similar triangles |

distance around the outside of a polygon | perimeter |

formula for perimeter of a rectangle | P = 2L + 2W |

formula for perimeter of a square | P = 4s |

formula for perimeter of a general polygon | P = sum of the sides |

formula for equilateral polygon | P = (number of sides)(side length) |

angles between 0-90 degrees | acute |

90 degree angles | right angles |

angles between 90- 180 degrees | obtuse |

180 degree angles | straight |

angles between 180-360 | reflex angles |

2 angles that have a common side between them and share a common vertex | adjacent angles |

When two lines intersect, they form 2 pairs of opposite angles called | vertical angles |

2 angles whose sum is 90 degrees | complementary |

2 angles whose sum is 180 degrees | supplementary |

a line that intersects two or more other lines | transversal |

angles between the parallel lines on opposite sides of the transversal | alternate interior angles |

angles outside the parallel lines on opposite sides of the transversal | alternate exterior angles |

angles on the same side of the parallel lines, along the same side of the transversal | corresponding angles |

triangle with 3 acute angles | acute triangle |

triangle with 1 obtuse angle | obtuse triangle |

triangle with 1 right angle | right triangle |

triangle with 3 equal sides | equilateral triangle |

triangle with 2 equal sides | isosceles triangle |

triangle with no equal sides | scalene triangle |

the sum of the interior angles of any triangle | 180 degrees |

the angle formed between an extended side and the triangle itself | exterior angle |