Abc's of Geometry
By Parker Davis January 2, 2012
AA similarity when two triangles have corresponding angles that are congruent as shown below, the triangles are similar  AAS if two angles and the nonincluded side one triangle are congruent to two angles and the nonincluded angle of another triangle, then these two triangles are congruent  Acute angle an angle with an angle measure less than 90°  Acute triangle a triangle where all three internal angles are acute  Alt. exterior angles alternate exterior angles are created where a transversal crosses two (usually parallel) lines. each pair of these angles is outside the parallel lines, and on opposite sides of the transversal.  Alt. interior angles alternate interior angles are created where a transversal crosses two (usually parallel) lines. each pair of these angles are inside the parallel lines, and on opposite sides of the transversal  Altitude a line that is perpendicular to the base and goes through the opposite vertex  Angle bisector a line that equally spits an angle into two parts  ASA if two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, then these two triangles are congruent  oBtuse triangle a triangle that has an angle with a measure greater than 90°  Centroid the point of congruency of three medians in a triangle  Circumcenter point of congruency of three perpendicular bisectors  Collinear points the points lying on the same line are called collinear points  Complementary angles two angles are complementary if they add up to 90°  Concave polygon a polygon that has one or more interior angles greater than 180°  Conditional statements a conditional is a compound statement formed by combining two sentences (or facts) using the words “if ... then” IF…THEN IF…THEN

Congruent two figures are congruent if they have...
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