### Ch. 1 Vocabulary Craziness

AB

The building blocks of geometry for success: Match each of the following words with its definition.

 1 acute angle _____ two angles that sum to 90º 2 adjacent angles _____ a closed figure made up of segments 3 bisector _____ the endpoint of 2 rays that form an angle 4 circumference _____ an angle that measures 180º exactly 5 collinear points _____ points or lines that lie on the same plane 6 complementary angles _____ a 2 dimensional figure that is straight & continuous in 2 directions 7 congruent _____ a pair of adjacent angles that form a line 8 conjecture _____ a line that cuts a segment or angle into two equal pieces 9 coplanar _____ a piece of a line that has 2 endpoints 10 intersection _____ a piece of a line that is continuous in one direction 11 line _____ an angle that measures more than 90º but less than 180º 12 linear pair _____ an educated guess based on patterns or examples 13 midpoint _____ the figure that represents location 14 obtuse _____ a point (or line) where 2 or more lines (planes) meet 15 opposite rays _____ points on the same line 16 plane _____ the distance around a polygon 17 ray _____ angles or segments that have the same measurement 18 right _____ an angle that measures less than 90º 19 segment _____ two angles that sum to 180º 20 straight _____ angles that are next door neighbors 21 supplementary _____ two collinear rays that share a common endpoint and travel in opposite directions 22 vertical _____ a 2-dimensional diagram that you can fold to form a 3-d figure 23 point _____ a point that divides a segment into two equal segments 24 coordinate _____ two angles that are not adjacent, always congruent, and formed by two intersecting lines 25 perimeter _____ an angle that measures 90º exactly 26 net _____ distance around a circle 27 polygon _____ numbers that correspond to a point on a number line or graph 28 vertex _____ a flat surface that is continuous in each direction

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