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# GEOMETRY - TERMS

### TERMINOLOGY - LINES AND ANGLES

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

POINT | MARKS AN EXACT LOCATION |

LINE | A COLLECTION OF POINTS IN A STRAIGHT PATH EXTENDING ENDLESSLY IN BOTH DIRECTIONS |

LINE SEGMENT | PART OF A LINE BETWEEN TWO POINTS |

RAY | PART OF A LINE WITH ONE ENDPOINT THAT EXTENDS ENDLESSLY IN ONE DIRECTION |

ANGLE | FORMED BY TWO RAYS WITH THE SAME ENDPOINT CALLED A VERTEX |

VERTEX | END POINT SHARED BY TWO RAYS |

CONGRUENT ANGLES | TWO ANGLES HAVING THE SAME MEASURE |

LINEAR PAIR | 2 supplementary adjacent angles whose noncommon sides form a line |

VERTICAL ANGLE | ANGLES ON OPPOSITE SIDES OF THE INTERSECTION OF TWO LINES |

ADJACENT ANGLES | 2 nonstraight and nonzero angles that have a common side in the interior of the angle formed by the noncommon sides |

CORRESPONDING ANGLES | any pair of angles in similar locations with respect to a transversal |

TRANSVERSAL | a line that intersects 2 others |

ALTERNATE INTERIOR ANGLES | - interior angles on alternate sides of the transversal (not on the same parallel line) |

ALTERNATE EXTERIOR ANGLE | - exterior angles on alternate sides of the transversal (not on the same parallel line) |

SUPPLEMENTARY ANGLES | TWO ANGLES WHOSE SUM IS 180 DEGREES |

COMPLIMENTARY ANGLES | TWO ANGLES WHOSE SUM IS 90 DEGREES |

BISECT | DIVIDE AN ANGLE OR SEGMENT INTO TWO CONGRUENT ANGLES OR SEGMENTS |

PLANE | AN INFINITE FLAT SURFACE |

PARALLEL LINES | LINES ON A PLANE THAT NEVER MEET |

TRANSVERSAL | LINE THAT INTERSECTS TWO OR MORE PARALLEL LINES |

CORRESPONDING ANGELS | ANGLES FORMED BY TWO LINES AND A TRANSVERSAL |

MIDPOINT | THE POINT THAT DIVIDES A SEGMENT INTO TWO CONGRUENT SMALLER SEGMENTS |

PERPENDICULAR LINES | LINES, RAYS, OR LINE SEGMENTS THAT INTERSECT AT RIGHT ANGLES |

PERPENDICULAR BISECTOR | A LINE, RAY OR SEGMENT THAT INTERSECTS A SEGMENT AT ITS MIDPOINT AND IS PERPENDICULAR |

SKEW LINES | TWO LINES THAT DO NOT INTERSECT AND ARE NOT PARALLEL; non-coplanar (NOT WITHIN THE SAME PLANE) lines that don't intersect |

QUADRALATERAL | A FOUR SIDED FIGURE (E.G. RECTANGLE, PARALLELOGRAM, RHOMBUS, TRAPEZOID); THE SUM OF THE MEASURES OF THE ANGLES OF ANY QUADRALATERAL IS 360 DEGREES; ANY QUADRALATERAL CAN BE DIVIDED INTO TWO TRIANGLES |

PARALELLOGRAM | a quadrilateral with two pair of parallel sides and two pair of congruent sides |

RHOMBUS | a parallelogram with four congruent sides |

TRAPEZOID | a quadrilateral that has ONLY one pair of parallel sides |

Isoscoles trapezoid | a trapezoid that has a pair of equiangular base angles |

Isoscoles triangle | a triangle with two sides of equal length |

RECTANGLE | A PARALLELOGRAM WITH FOUR RIGHT ANGLES |

POLYGON | A GEOMETRIC FIGURE WITH AT LEAST THREE SIDES |

REGULAR POLYGON | A POLYGON IN WHICH ALL OF THE SIDES AND ANGLES ARE CONGRUENT |

POLYGON - SUM OF ANGLES = | (NUMBER OF SIDES - 2)*180 |

(n-2)*180 | SUM OF POLYGON ANGLES |

AREA OF GEOMETRIC FIGURE | THE NUMBER OF SQARE UNITS NEEDED TO COVER THE FIGURE |

PERIMETER | THE DISTANCE AROUND A POLYGON |

AREA OF A TRIANGLE | 1/2 base * height (1/2bh) |

AREA OF A PARALLELOGRAM | base * height (bh) |

AREA OF A TRAPEZOID | 1/2h(b1 + b2) |