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Geometry Review for Final 1st Semester 2016-2017 (Part 2) Key Vocabulary and Concepts Line Segment Congruent Midpoint Angle Bisector Parallel lines Perpendicular bisector Skew lines Right angle Reflexive Hypothesis Adjacent angles Complementary Supplementary Conditional Biconditional Converse Vertical angles Law of Syllogism Law of Detachment Transversal Acute triangle Obtuse triangle Right triangle Corresponding angles Alternate interior angles Consecutive interior angles Exterior angle of a polygon Remote interior angles Alternate exterior angles Regular polygon Vertex angle Isosceles triangle Hypotenuse SSS Postulate SAS Postulate ASA Postulate AAS Theorem HL Theorem CPCTC Congruent angles Slope Formulas æx +x y +y ö 1. Midpoint Formula: ç 1 2 , 1 2 ÷ è 2 2 ø 2. Distance Formula: d = 3. Slope: m = (x2 - x1 )2 + (y2 - y1 )2 y2 - y1 x2 - x1 4. Point-slope equation: y - y1 = m(x - x1 ) 5. Slope-intercept equation: y = mx + b Median Altitude Circumcenter Circumscribe Incenter Inscribe Centroid Orthocenter Concurrent Midsegment Inverse Contrapositive Negation Ray Linear pair Equilateral Equiangular Scalene Rigid motion 6. Standard form of a linear equation: Ax + By = C Postulates and Theorems On page PT2 there is a list of Postulates you need to know (1-21), and on page PT3 you will find Theorems and Properties you need to know (From Properties of Segment Congruence to Congruency of Altitudes of a Triangle). Please review them.