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# Math Vocab 51-113

### Vocabulary 51-113

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

prime number | a number having exactly 2 factors; 1 and itself |

composite number | number having more than two factors. Example: 6 is a composite number because its factors are 1,2, 3, and 6 |

array | An arrangement of objects in rows and columns |

perimeter | the distance around the OUTSIDE of a figure |

area | the number of units needed to cover the INSIDE surface of a figure |

Greatest common factor(GCF) | the greatest factor that two or more numbers have in common |

least common multiple (LCM) | the least number other than zero, that is a common multiple of two or more numbers |

geometry | the study of lines, points, planes, angles, and surfaces |

point | an exact place or location in space represented by a dot labeled with a capital letter |

endpoint | the point at the end of a line segment |

line | a collection of points along a straight path that goes on forever |

line segment | part of a line having 2 end points |

parallel lines | lines extending in the same direction and are always the same distance apart |

perpendicular lines | two lines or line segments that cross to form right angles |

intersecting lines | lines that cross or meet |

ray | a part of a line that has one endpoint |

vertex | the comer point of an angle, polygon, or solid |

angle | a figure formed by two rays that have a common endpoint |

right angle | an angle measuring 90 degrees |

acute angle | an angle measuring less than 90 degrees |

obtuse angle | an angle measuring more than 90 and less than 180 degrees. |

straight angle | an angle that measures 180 degrees |

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

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

protractor | a tool used for measuring or drawing angles |

plane | a flat surface that goes on forever in all directions |

intersecting planes | planes that intersect to form a line |

similar | same shape, but not necessarily the same size |

congruent | same size and shape |

uni | 1 |

bi | 2 |

tri | 3 |

quad | 4 |

penta | 5 |

hexa | 6 |

hepta | 7 |

octa | 8 |

nona | 9 |

deci/deca | 10 |

centi | 100 |

milli | 1000 |

polygon | a closed figure formed by line segments |

regular polygon | all sides and angles must be congruent within the shape |

irregular polygon | all sides and angles are NOT congruent |

diagonal | a line segment that joins two vertices of a polygon, but is not a side of a polygon |

line of symmetry | a line along which you could fold a figure so both halves match |

half-turn symmetry | if a figure matches itself exactly after a half turn about its center point, then it has half turn symmetry |

rotational symmetry | if a figure is rotated less than 360 degrees around a central point and it still matches the original figure, then it has rotational symmetry |

quadrilateral | a four sided polygon |

square | a figure having four equal sides with four right angles |

rectangle | a quadrilateral having four sided and four right angles |

parallelogram | a quadrilateral with two sets of parallel sides |

rhombus | a quadrilateral with four congruent sides |

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

triangle | a three sided figure |

Triangles a classified by their _________ and __________. | sides, angles |

equilateral triangle | a triangle with all congruent sides |

isosceles triangle | a triangle with two congruent sides |

scalene triangle | a triangle with NO congruent sides |

right triangle | a triangle with a 90 degree angle |

acute triangle | a triangle with 3 acute angles |

obtuse triangle | a triangle with 1 obtuse angle |

leg | in a right triangle, either of the two sides that form the right angle |

hypotenuse | in a right triangle, the side opposite the right angle, it is the longest side in a right angle |

Created by:
abbycorrao