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Centroid

The point of concurrency of the medians of a triangle

Orthocenter

the point of concurrency of the altitudes of a triangle

Incenter

the point of concurrency of the angle bisectors of a triangle

Circumcenter

the point of concurrency of the perpendicular bisectors of a triangle

inverse

the statement formed by negating the hypothesis and conclusion of a conditional statement

contrapositive

the statement formed when you negate the hypothesis and conclusion of the converse of a conditional statement

converse

the statement formed by switching the hypothesis and conclusion of a conditional statement

triangle inequality theorum

sum of the measure of any 2 sides of a triangle must be greater than the 3rd side/base measure

isosceles triangle theorum

the two congruent sides of an isosceles triangle are opposite the congruent angles

triangle sum theorum

the interior angles of a triangle sum to 180

pythgorean theorum

in a right triangle a2+b2=c2