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Ch.1-6 Definitions

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Question
Answer
undefined terms   point, line,plane  
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adjacent angles   nonoverlapping angles that share a vertex and side  
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counterexample   an example that meets the definition but isn't what it's describing  
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skew lines   non-coplanar lines that don't intersect  
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vertical angles   non adjacent angles formed by intersecting lines  
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polygon   a closed figure in a plane, connecting line segments endpt. to endpt., each segment intersects two others  
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quad.   4 sided polygon with atleast one pair of congruent sides  
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undecagon   11 sided polygon  
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regular polygon   all angles and sides congruent  
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right triangle   triangle with one right angle  
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acute triangle   all angles are acute  
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obtuse triangle   only one obtuse angle  
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isc. triangle   atleast 2 congruent sides  
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trapezoid   quadrilateral w/ exactly one pair of parallel lines  
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isc. trapezoid   non parallel sides are congruent  
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kite   quad with 2 pairs of consecutive congruent sides  
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parallelogram   quad. with both pairs of sides parallel  
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rhombus   pgram w/ all congruent sides  
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rectangle   pgram w/ 4 right angles  
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square   pgram w/ 4 right angles & all congruent sides  
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circle   set of pts on a plane that have a radius & a center pt  
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congruent circles   same radius  
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concentric circles   circles that share the same center  
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minor arc   arc smaller than a semicircle  
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major arc   arc bigger than a semicircle  
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geometry   a way to measure earth  
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inductive reasoning   based on experience  
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deductive reasoning   based on rules  
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transversal   line that intersects parallel lines  
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incenter   the pt of concurrency for angle bisectors of an triangle  
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circumcenter   the pt. of concurrency for perpendicular bisectors of a triangle  
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Centroid   center of gravity, pt. of concurrency for 3 medians  
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arc length   distance from one endpoint of an arc to the other endpoint of the arc  
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isometric   drawing that shows 3 sides of an object in one view  
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