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# Grade8 Geometry

### Geometry Terms

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

an exact location in space | point |

a straight path that extends without end in opposite directions | line |

a flat surface that extends forever | plane |

a part of a line between two endpoints | segment |

a part of a line that starts at one endpoint and extends forever | ray |

an angle that measures 90 degrees | right angle |

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

an angle that measures greater than 90 degrees but less than 180 degrees | obtuse angle |

two angles whose measures add up to 90 degrees | complementary angles |

two angles whose measures add up to 180 degrees | supplementary angles |

having the same size and shape | congruent |

a pair of opposite congruent angles formed by intersecting lines | vertical angles |

lines in a plane that do not intersect | parallel lines |

lines that intersect to form right angles | perpendicular lines |

a line that intersects two or more lines | transversal |

the theorem that states that the measures of the angles in a triangle add up to 180 degrees. | Triangle Sum Theorem |

a triangle with all angles measuring less than 90 degrees | acute triangle |

a triangle with one right angle | right triangle |

a triangle with three congruent sides and three congruent angles | equilateral triangle |

a triangle with at least two congruent sides and two congruent angles | isoceles triangle |

a triangle with no congruent sides and no congruent angles | scalene triangle |

a closed plane figure formed by three or more segments | polygon |

a closed plane figure with sides and angles of equal measures | regular polygon |

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

a four sided polygon | quadrilateral |

a quadrilateral with four right angles | rectangle |

a quadrilateral with two pairs of parallel sides | parallelogram |

a quadrilateral with four congruent sides | rhombus |

a quadrilateral with four right angles and four congruent sides | square |

a five sided polygon | pentagon |

a six sided polygon | hexagon |

an eight sided polygon | octogon |

a quadrilateral with two adjacent sets of congruent sides | kite |

Created by:
janepope