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Preface 4ÀúÀÚ ¼Ò°³ 5ÀÌ Ã¥ÀÇ Æ¯Â¡ 6Topic 1 Basic Elements of Geometry 111.1 Points, Lines, and Planes 121.2 Line, Segment, and Ray 151.3 Coordinate Plane 181.4 Angle and Its Measure 211.5 Relationship between Geometric Objects 25Topic 2 Mathematical Reasoning 392.1 Induction and Deduction 402.2 Algebraic Proof and Geometric Proof 452.3 Basic Postulates for Segments and Angles 46Topic 3 Parallel and Perpendicular Lines 593.1 Parallel Lines and Transversal 603.2 Distance Formula Revisited 63Topic 4 Congruent Triangles 754.1 Basic Classification of Triangles 764.2 Congruent Triangles 784.3 Congruence Postulates 804.4 Finding Congruent Triangles in Isosceles Triangle 81Topic 5 Triangle Properties 955.1 Angle Bisector Theorem 965.2 Points of Concurrency 985.3 Properties of Right Triangle 1015.4 Triangular Inequality 102Topic 6 Similar Triangles 1156.1 Similar Triangles 116Topic 7 Quadrilateral 1297.1 Quadrilateral and Trapezoid 1307.2 Parallelogram, Rhombus, Rectangle and Square 133Topic 8 Polygons 1498.1 Introduction to Polygon 1508.2 Angle Chasing 1518.3 Area of Polygon (Hexagon or Octagon) 1538.4 Diagonals of Polygons 156Topic 9 Circles 1639.1 Terminology 1649.2 Arcs, Angles and Chords 165Topic 10 Transformation 18310.1 Translation and Rotation 18410.2 Reflection and Dilation 187Topic 11 Solid Figures 19711.1 Polyhedron and Solids of Revolution 19811.2 Surface Area 20211.3 Volume 206Topic 12 Trigonometric Ratio 21512.1 Basic Ratio 216Solution to 120 Walk-Through Exercises 225