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# Geom. Vocab. Midterm

### Mr. Rosado's Geometry Vocabulary Midterm Review

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

point | simplest figure, no size, "like a dot"; in a coordinate plane, it is an ordered plane (x,y) that can represent a location |

line | has no thickness, it is a set of all points extending in two directions indefinitely |

plane | a flat surface extending in 2-D, has no thickness |

space | set of all points in 3-D |

coplanar | points or geometric figures in the same plane; "to be on the same plane" |

collinear | points or geometrical figures on the same line or "straight path"; "to be on the same line" |

segment | set of all points between two endpoints |

midpoint | exact center of two endpoints of a segment |

equidistant | to be the same distance; "equal distance" |

congruent segments | segments with equal measures or "same length" |

ray | "part of a line"; has one endpoint and continues in one direction indefinitely |

angle | two non-collinear rays that share a common endpoint form an angle |

vertex | the point that two rays share to form an angle |

opposite rays | two collinear rays that have a common endpoint |

straight angle | pair of opposite rays; 180° |

sides of an angle | the two rays that from an angle |

obtuse angle | angle measure that is > 90° |

right angle | angle measure that is = 90° |

acute angle | angle measure that is < 90° |

segment bisector | a line, ray, or segment that separates a segment into two congruent segments |

angle bisector | a line, ray, or segment that separates an angle into two congruent angles |

congruent angles | angles that have the same angle measure |

adjacent angles | coplanar angles that have a common side and vertex |

vertical angles | two non-adjacent angles formed by two intersecting lines |

linear pair | adjacent angles with non-common sides |

supplementary | two angles with measures adding up to 180° |

complementary | two angles with measures adding up to 90° |

perpendicular lines | two lines that intersect to form right angles |

conjecture | "educated guess" |

conditional statement | "If ... then" statement |

hypothesis | "If ..." part of a conditional |

conclusion | "... then" part of a conditional |

converse | when you interchange the hypothesis and the conclusion of a conditional |

postulate | principles that re accepted to be true, "axiom" |

theorems | statements that are proved using definitions, postulates, and undefined terms using deductive reasoning |

parallel lines | two lines in a plane that never meet |

skew lines | two lines that do not intersect and are not in the same plane |

transversal | a line that intersects two or more lines in a plane |

polygon | a closed plane figure with segments for sides that only intersect at the endpoints called the vertices |

triangle | a three-sided polygon; all angles add up to 180° |

acute triangle | a triangle with all three interior angles acute |

obtuse triangle | a triangle with only and exactly one interior angle that is obtuse |

right triangle | a triangle with only and exactly one interior angle that is right |

equiangular triangle | a triangle with all three interior angles congruent; a triangle with all three angles being 60° |

scalene triangle | a triangle with all three sides different in length |

isosceles triangle | a triangle with at least two sides congruent; a triangle with congruent legs, congruent base angles, and the base opposite from the vertex angle |

equilateral triangle | a triangle with all three sides congruent |

CPCTC | Corresponding Parts of Congruent Triangles are Congruent |

median | a segment that connects the vertex of a triangle to the midpoint of the opposite sides |

altitude | a segment that connects the vertex of a triangle to the line containing the opposite side and forms a right angle to that line |

angle bisector | a segment that bisects an angle or triangle |

perpendicular bisector | a line or segment that passes through the midpoint of a side of a triangle and is perpendicular to that side |

parallelograms | 1. opposite sides are parallel 2. opposite sides are congruent 3. opposite angles are congruent 4. consecutive angels are supplementary 5. diagonals bisect each other |

rhombus | 1. all four sides are congruent 2. diagonals perpendicular 3. diagonals bisect opposite angles 4. all properties of parallelograms |

rectangle | 1. all four angles are right angles 2. diagonals are congruent 3. all properties of parallelograms |

square | 1. all properties of rhombuses 2. all properties of rectangles |

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

isosceles trapezoid | a trapezoid with both legs congruent |

midsegment of a trapezoid | a segment connecting the midpoints of the legs of a trapezoid |

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