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geometry
| Question | Answer |
|---|---|
| acute angle | an angle with a measure greater than 0 degrees and less than 90 degrees |
| adjacent angles | angles that share an common ray and have the same origin |
| angle | a geometric figure formed by two rays joined at their origins |
| bisect | to divide into two equal parts |
| bisector | a line or line segment that divides another figure into two equal parts |
| collinear | lying on the same line |
| complementary angles | two angles with measures that add up to 90 degrees |
| congruent | having exactly the same size and shape |
| coplanar | lying in the same plane |
| degree | a unit of measure for angles; 1/360th of a circle |
| empty set | a set having no elements; also called a null set |
| infinite | without end; unable to be counted or measured |
| interior angle | angle within a polygon; angle within two parallel lines that are crossed by a transversal |
| line | in geometry, a set of connected points that extends infinitely in two directions |
| line segment | a section of a line bounded by two endpoints |
| midpoint | the point exactly in the center of a line segment |
| null set | a set having no elements; also called empty set |
| obtuse angle | an angle with a measure greater than 90 degrees and less than 180 degrees |
| origin | the endpoint of a ray; on a coordinate grid, the point at the intersection of the axes, generally identified by the ordered pair ( 0, 0 ) |
| parallel lines | lines in the same plane that do not intersect |
| perpendicular lines | lines that form right angles when they intersect |
| perpendicular bisector | a line or line segment that is perpendicular to another line segment through its midpoint |
| pi | the Greek letter, which represents an irrational number with an approximate value of 22/7 or 3.14 |
| plane | a flat, two dimensional surface that extends infinitely in all directions |
| plane geometry | the study of figures that all lie in one plane |
| point | a defined position in space that has no dimension; represented with a dot |
| protractor | a device used to measure the number of degrees in an angle |
| ray | a geometric figure that starts at a definite point (called the origin) and extends infinitely in one direction |
| reflex angle | an angle that has a measure between 180 degrees and 360 degrees |
| right angle | an angle measuring 90 degrees |
| set | a collection of items |
| straight angle | an angle with an measure of 180 degrees |
| subset | a part of a given set |
| supplementary angles | two angles with measures that add up to 180 degrees |
| union | the combined elements from two or more sets |
| vertex | the endpoint shared by two rays, line segments, or edges; plural is verticles |
| vertical angles | the angles opposite each other when two lines intersect |
| circle | a set of points an equal distance from the center |
| radius | the distance from the center to the edge |
| chord | intercepts the circle |
| circumstance | the perimeter of circle |
| oval/ellipse | a stretched circle |
| diameter | measures through |
| secant | where a line goes through at a couple points |
| sector | a piece of the area of the circle |
| edge | the lines where the faces of a rectangular solid meet |
| cubed units | the volume of a geometric solid |
| vertices | the edges of a rectangular solid meet in points called |
| circle | the base of a cylinder is a |
| face | the flat surface of an rectangular solid |
| cylinder | geometric solid with a circular base and sides perpendicular to the base |
| altitude | height of a triangle |
| vertex | the endpoint shared by two rays, line segments, or edges. |
| slant height | the height of a triangle forming a face of a pyramid |
| faces | one of the flat surfaces of a solid |
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