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Flashcards by patticlj, updated 7 months ago

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geometry vocabulary flashcards

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Question | Answer |

parallel lines | Parallel lines are always the same distance apart, and will never touch. 90b8479c-8d2b-4f7a-b3ab-8a65f4cfeb0e.jpg (image/jpg) |

perpendicular lines | Perpendicular lines meet or cross to form right (90 degree) angles. 8171267d-d884-46ce-be4c-9724901f5c95.jpg (image/jpg) |

straight angle | Straight angles are also known as straight lines, and measure 180 degrees. bd9ad627-1255-4f92-ad16-94474e2a0009.png (image/png) |

acute angle | An acute angle measures more than 0 degrees, but less than 90 degrees. ff5c6688-fa37-4d14-8039-3efadefba9f7.png (image/png) |

obtuse angle | An obtuse angles measures more than 90 degrees, but less than 180 degrees. |

right angle | A right angle measures exactly 90 degrees. Right angles are sometimes called "square corners", because they look like the corners of a square or a rectangle. |

triangle | A triangle is a polygon with exactly three sides and three angles. |

acute triangle | An acute triangle is a triangle whose three angles are ALL acute angles (less than 90 degrees). |

obtuse triangle | A triangle with exactly ONE obtuse angle. (More than one obtuse angle would mean the three angles could not add up to 180 degrees.) |

right triangle | A triangle with exactly ONE right angle. (More than one right angle would mean the three angles could not add up to 180 degrees.) |

equilateral triangle | A triangle whose three sides are ALL the same length. (Also called an equiangular triangle, because the three angles would also have equal measures.) |

isosceles triangle | A triangle with two (or three) sides being equal in length. |

scalene triangle | A triangle whose three sides all have different lengths. |

quadrilateral | A polygon having exactly four sides and four angles. |

parallelogram | A quadrilateral whose opposite sides are both congruent (equal in length) and parallel. Rectangles, squares, and rhombuses (rhombi) are all special types of parallelograms. |

rectangle | A parallelogram whose four angles are all right angles. |

rhombus | A parallelogram whose four sides are all congruent. |

square | A parallelogram whose four sides are all congruent (making it also a rhombus) and whose four angles are all right angles (making it a rectangle). |

trapezoid | A quadrilateral with EXACTLY ONE pair of parallel sides - the other pair is NOT parallel, so a trapezoid is not a parallelogram. |

pentagon | A polygon with 5 sides and 5 angles. |

hexagon | A polygon with 6 sides and 6 angles. |

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