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# math ch. 7 voc

### ph math ch 7 vocabulary words

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

point | tells a location |

line | series of points that have no end |

segment | part of a line but it has two endpoints |

intersecting lines | lines that cross at one point |

parallel lines | lines that never cross |

angle | formed by two rays or line segments |

vertex | point where two line segments or rays meet |

acute angle | an angle between 0 and 90 |

right angle | an angle that is exactly 90 |

obtuse angle | an angle that is between 90 and 180 |

straight angle | an angle that is exactly 180a line |

complementary angle | two angle measurements that when added equal 90 |

supplementary angle | two angle measurements that when added equal 180 |

adjacent angles | side by sideshare a vertex and a side |

vertical angles | angles across from each othershare a vertex but no sidescongruent |

congruent angles | two angles exactly the same measurement |

midpoint | point that divides a line segment into two equal parts |

perpendicular lines | two lines that form right angles |

arc | part of circle |

angle bisector | a line that divides an angle into two congruent or equal angles |

congruent | ~= |

congruent sides | sides that are the same length |

triangle | 3 sided closed polygon |

scalene triangle | a triangle with no congruent sides |

isosceles triangle | a triangle with at least 2 congruent sides |

equilateral triangle | a triangle with all sides congruent |

sum of angles in triangle | 180 |

right triangle | a triangle with one right angle |

acute triangle | a triangle with 3 acute angles |

obtuse triangle | a triangle with one obtuse angle and two acute angles |

polygon | closed plane figure with sides formed by line segments |

quadrilateral | a polygon with four sides |

pentagon | a polygon with five sides |

hexagon | a polygon with six sides |

heptagon | a polygon with seven sides |

octagon | a polygon with eight sides |

nonagon | a polygon with nine sides |

decagon | a polygon with ten sides |

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

irregular polygon | a polygon with no sides or angles congruent |

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

isosceles trapezoid | a trapezoid with congruent non-parallel sides |

parallelogram | a quadrilateral with both pairs of opposite sides parallel and congruent |

rectangle | parallelogram with four right angles |

square | a parallelogram with four right angles and four congruent sides |

rhombus | a parallelogram with four congruent sides and no right angles |

circle | a set of points that are the same distance from the center |

radius | segment from the center to a point on the circle |

diameter | segment from one point on circle through the center to another point on the circle |

chord | segment from one point on circle to another point on circle. Does not go through the circle. |

central angle | an angle in the circle where the vertex is the center of the circle |

semi-circle | half of the circumference of a circle |

circle graph | a graph of data where a circle represents the whole (100%) |

Created by:
jenwoodlief