# Abc's of Geometry

Topics: Triangle, Angle, Polygon Pages: 4 (1205 words) Published: February 4, 2012
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 non-included side one triangle are congruent to two angles and the non-included 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

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Congruent| two figures are congruent if they have...