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# Math Support 3/23/09

### Math Support 6th Grade Cavallo Chapter 5 Geometry and Measurement

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

perimeter | the distance around a figure |

area | the space a figure encloses |

line | extends forever in two directions |

ray | a part of a line; extends forever in one direction and has one endpoint |

line segment | a part of a line |

angle | two rays with a common endpoint |

vertex | the common endpoint of an angle |

acute angle | an angle that measures less than 90 degrees |

right angle | an angle that measures exactly 90 degrees |

obtuse angle | an angle that measures more than 90 degrees and less than 180 degrees |

straight angle | an angle that has a measure of exactly 180 degrees; it is a line |

protractor | a tool used to measure angles |

complementary angles | two angles that add up to 90 degrees |

supplementary angles | two angles that add up to 180 degrees |

congruent | when two figures have the same shape and the same size |

bisect | divides a figure into two equal parts |

plane | an infinite, flat surface |

parallel | lines that never meet |

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

midpoint | the point that divides a line segment into two equal segments |

perpendicular | lines, rays, and line segments that form right angles |

quadrilateral | four-sided figure |

parallelogram | quadrilateral with two pairs of parallel sides and two pairs of congruent sides |

rectangle | quadrilateral; parallelogram; has four right angles |

square | quadrilateral; parallelogram; rectangle; rhombus; has four right angles and four congruent sides |

rhombus | quadrilateral; parallelogam; has four congruent sides |

trapezoid | quadrilateral; has only one pair of parallel sides |

polygon | a geometric figure with at least three sides |

triangle | a polygon with three sides |

pentagon | a polygon with five sides |

hexagon | a polygon with six sides |

octagon | a polygon with eight sides |

regular polygon | a polygon where all of the sides and all of the angles are equal |

(n - 2)180 | formula to find the sum of the measures of the angles; n is the number of sides of the polygon |

perfect square | the square of a whole number |

square root | the length of the side of a square with an area equal to the number |

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

legs | the two sides of the right triangle (NOT the hypotenuse) |

pythagorean theorem | formula used to find a missing length of a right triangle; the sum of the squares of athe legs of a right triangle is equal to the square of the hypotenuse |

area of a triangle | one half the product of the lengths of the base and the height |

area of a parallelogram | the product of its height and the length of its base |

Created by:
mnash