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# chapter 1

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

acute angle | greater than 0 degrees and less than 90 degrees |

adjacent angle | two angles in same plane with a common vertex and a common interior points |

angle | figure formed by two rays, or sides |

angle bisector | a ray that divides any angle into two congruent angles |

area | number of nonoverlappping square units of a given size that exactly cover the figure |

base | any side of a figure |

between | given three point A,B and C,B is between A and C if and only if all three of the points lie on the same linear and AB+BC= AC |

bisect | to divide into two congruent parts |

circumference | a circle is the distance around a circle |

collinear | points that lie on the same line |

complementary angles | two angles whose measure have a sum of 90 degrees |

congruent angles | angles that have the same measure |

congruent segments | segments that have the same lengths |

construction | a way of creating a figure that is more precise |

coordinate | a point corresponds to one and only number on the ruler |

coordinate plane | a plane that is divided into four regions by a horizontal line (x-axis) and a vertical line (y-axis) |

coplanar | points that lie in the same plane |

degree | a unit of angle measure; one degree is 1/360 of a circle |

diameter | segment that passes through the center of the circle and whore endpoints are on the circle |

distance | between any two points is the absolute value of the difference of the coordinates |

endpoint | a point at one end of a segment or the starting point of a ray |

exterior of an angle | set of all points outside the angle |

height | a segment from a vertex that forms a right angle with a line containing the base |

hypotenuse | the side across from the right angle that stretches from one leg to the other |

image | resulting figure |

interior of an angle | the set of all points between the side of the angle |

leg | one of the two congruent sides of the isosceles triangles |

length | the distance between the two endpoints of a segment |

line | a straight path that has no thickness and extends forever |

linear pair | pair of adjacent angles whose noncommon sides are opposite rays |

measure | angles are measured in degrees |

midpoint | the points that divides a segment into two congruent segment |

obtuse angle | measure greater than 90 degrees and less than 90 degrees |

opposite rays | two rays that have a common endpoints and form a line |

perimeter | sum of the side lengths of the figure |

pi | the ratio of the circumference of a circle to its diameter (3.14 or 22/7) |

plane | a flat surface that has no thickness and extends forever |

point | names a location and has no size |

postulate (axiom) | a statement that is accepted as true without proof POSTULATE ABOUT POINTS, LINES, AND PLANES HELP DESCRIBE GEOMETRIC PROPERTIES |

preimage | the original figure |

radius | a segment whose endpoints are the center of the circle and a point on the circle |

ray | part of line that starts at an endpoint and extents forever in one directon |

refection ( flip) | |

right angles | measure 90 degrees ` |

rotation(turn) | each point and its image are the same distance from p |

segment | part of a line consisting of two points and all point between them |

segment bisector | any ray segment or line that intersects a segment its midpoints |

straight angle | formed by two opposite rays and measure 180 degrees |

supplementary angles | two angles whose measures have a sum of 180 degrees |

transformation | a change in the position, size, or shape of a figure |

translation ( slide) | which all the points of a figure move the same distance in the same direction |

undefined term | basic figure |

vertex | common endpoints |

vertical angles | two nonadjacent angles formed by two insecting lines |

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