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Geometry Words

Arena Project

Altitude of a Triangle A straight line through a vertex and perpendicular to (i.e. forming a right angle with) a line containing the base (the opposite side) of a triangle
Angle bisector theorem Concerned with the relative lengths of the two segments that a triangle's side is divided into by a line that bisects the opposite angle. It equates their relative lengths to the relative lengths of the other two sides of the triangle.
Angle bisector theorem, converse If a point is equidistant from the sides of an angle, then it is on the angle bisector.
Center of a Polygon In a rotation, the point that does not move. The rest of the plane rotates around this one fixed point.
Centroid of a Triangle The point where the three medians of the triangle intersect
Circumcenter of a triangle The point where the three perpendicular bisectors of a triangle meet
Circumscribed A geometric figure that is drawn around another geometric figure so as to touch all its vertices
Conditional probability formula The conditional probability of A given B is denoted by P(A|B) and defined by the formula P(A|B) = P(AB) P(B) , provided P(B) > 0. (see also probability formula)
Experimental probability The ratio of the number of times the event occurs to the total number of trials (see also complement probability, conditional probability, probability, theoretical probability)