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### 48 Cards in this Set

• Front
• Back
 Conjecture? an unproven statement that is based on observations Inductive reasoning? process that involves looking for paterns adn making conjectures Counterexample? an example that shows a conjecture is false Point? has no dimension Line? extends in one dimension Plane? extends in two dimensions Collinear points? points that lie on the same plane Coplaner points? points that lie on the same plane Angle? two different rays that have the same intital point Acute angle? has a measure greater than 0 less than 90 Right angle? measure of 90 Obtuse angle? measure greater that 90 less than 180 Straight angle? measure = to 180 Adjacent angles? two angles that share a common vertex and side Segment bisector? segment,ray,line, or plane that intersects a segment at its midpoint Angle bisector? a ray that divides an angle into two adjacent angles that are congruent Vertical angles? two angles that their sides form two pairs of opposite rays Linear pair? two adjacent angles that their noncommon sides are opposite rays Complementary angles? two angles have a sum of 90 Supplememtary angles? two angles have a sum of 180 Conditional Statement? has two parts - a hypothesis and conclusion If-then? if part is hypothesis, than part is conclusion Converse? b~a Inverse? -a~-b Contrapositive? -b~-a Biconditional? if and only if Angle bisector? a ray that divides an angle into two adjacent angles that are congruent Vertical angles? two angles that their sides form two pairs of opposite rays Linear pair? two adjacent angles that their noncommon sides are opposite rays Complementary angles? two angles have a sum of 90 Supplememtary angles? two angles have a sum of 180 Conditional Statement? has two parts - a hypothesis and conclusion If-then? if part is hypothesis, than part is conclusion Converse? b~a Inverse? -a~-b Contrapositive? -b~-a Biconditional? if and only if Law of Detachment? If p~q is a true conditional statement and p is true, then q is true . Law of Syllogism? If p~q and q~r are true conditional statements, the p~r is true Center of Altitudes? Orthocenter Center of Medians? Centroid Center of Angle bisectors? incenter center of perp. bisecters? circumecenter Triangle inequality theorem? The sum pf the lengths of any two sides of a triangle is greater than the length of the third side. Midsegment Theorem? the segment connecting the midpoints of two sides of a triangle is parallel tot eh 3rd side and is half as long. Isometry? transformation that perserves lengths line of symmerty? the figure can be mapped onto itself by a reflection of a line glide reflections/ transformation in which every point p i smapped onto a point p"