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# 10th grade Geometry

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

point | specific location |

line | goes on forever in both directions and has at least 2 points |

plane | 2 dimensions |

collinear points | points on the same line |

coplanar points | points on the same plane |

line segment | part of a line with 2 endpoints |

endpoints | points at the end of a segment or start of a ray |

ray | goes on forever in 1 direction |

opposite rays | 2 rays that share the same endpoint and go in opposite directions |

intersection | the place where 2 things meet |

postulate/axium | a rule that is accepted without proof |

theorem | a rule that can be proved |

midpoint | a point in the middle of a segment |

segment bisector | a line/ray that divides a segment into 2 congruent parts |

angle | 2 rays with a common endpoint |

vertex | a common endpoint in 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 between 90 and 180 degrees |

straight angle | an angle that measures exactly 180 degrees |

angle bisector | a ray that divides an angle into 2 congruent angles |

complementary angles | 2 angles that add to 90 degrees |

supplementary angles | 2 angles that add to 180 degrees |

adjacent angles | 2 angles that share a common side |

linear pair | 2 adjacent angles that add to 180 degrees |

vertical angles | angles opposite from each other that are congruent |

polygon | a closed plane figure with 3 or more side and separate vertices |

convex | does not cave in |

concave | caves in |

equilateral polygon | a polygon with a congruent sides |

equilangular polygon | a polygon with all interior angles congruent |

regular polygon | both equilateral and equilangular |

conjecture | something unproven based on observations |

inductive reasoning | conjectures based on patterns and observations |

counter example | proves a conjecture wrong |

conditional statement | an if, then statement |

hypothesis | the "if" part of a conditional statement |

conclusion | the "then" part of a conditional statement |

negation | the opposite of the original statement |

inverse | if not p then not q |

deductive reasoning | conjectures based on facts, definitions, properties, and laws of logic |

law of sylogism | if p, then q. If q, then r. If p, then r. |

parallel lines | 2 coplanar lines that never intersect |

perpendicular | 2 lines that cross at 90 degree angle |

transversal | a line that intersects 2 or more lines at different points |

consecutive interior | inside the 2 lines on the same side |

converse | switches the hypothesis and conclusion: if q then p |

biconditional | uses the phrase "if and only if" |

contrapositive | if not q then not p |

law of detachment | gives you a true statement and an additional statement to form a conclusion |

skew lines | 2 non-coplanar lines that never intersect |

corresponding | angles in the same position on different lines. The angles are congruent. |

alternate interior | inside the 2 lines on opposite sides |

alternate exterior | outside the 2 lines on opposite sides |

Created by:
tcox2