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15 Cards in this Set
 Front
 Back
circumcenter

the point of concurrency of the perpendicular bisectors of a triangle


incenter

the point of concurrency of the angle bisectors of a triangle


centroid

the point of concurrency of the medians of a triangle


altitude

the perpendicular segment from a vertex of a triangle to the opposite side or to the line that contains the opposite side


orthocenter

the point of concurrency of the lines containing the altitudes of a triangle


concurrent lines

three or more lines that intersect in the same point


corollary

a statement that can be proved easily using a theorem or a definition


base angles

angles that are on the base of a isosceles triangle


skew lines

two lines that do not intersect and are not coplanar


supplementary
complementary 
adds up to 180
adds up to 90 

converse

switching the hypothesis and the conclusion
1>2 2>1 

inverse

the statement formed when you negate the hypothesis and conlusion of a conditional statement
<3> <3 </3> </3 

contrapositive

the statement formed when you negate the hypthesis and concluesion of the converse of a conditional statement
if 1 then 2 if not 2 then not 1 

biconditional statement

a statement that contains the phrase if and only if


equivalent statements

when two statements are both true or both false
