## Geometry

Vocabulary

Dictionary - Oracle Think Quest |

Dictionary - Cool Math |

Geometry Glossary - Definitions of many geometry terms |

Foundations of Geometry - Unit 1

Undefined Terms - Points, Lines, & Planes, Collinear, Coplanar Points, Intersecting Lines in Space, Skew Lines, Angles & Pairs of Angles |

Undefined Terms - Regent Prep Oswego NY |

Basic Terms - Math is Fun |

Undefined Terms - Grade A Math Help |

Pairs of Angles - WYZAnt |

Undefined Terms - Math Open Reference |

Distance & Midpoint Formulas

Distance Formula - Purple Math |

Distance Formula on Coordinate Plane |

Midpoint of a Line Segment - Math Open Reference |

Constructions

Copy Angle, Copy Line Segment, Bisect Line Segment, Bisect an Angle, Perpendicular from a point on a line, Perpendicular from a point not on a line, Perpendicular Bisector, triangle inscribed in a circle, square inscribed in a circle, & triangle circumscribed about a circle |

How to do construction problems - Math Open Reference |

Basic construction - Regent Prep Oswego NY |

Logic - Unit 2

Inductive Reasoning, Conjectures, Counterexamples Logic – Truth Values, Conjunction, Disjunction, Truth Tables and Venn Diagrams, Conditional Statement, If Then Form, Converse, Inverse, & Contrapositive Deductive Reasoning, Law of Detachment, & Law of Syllogism |

Conjunction, Disjunction, Conditional, Biconditional - Regent Prep Oswego NY |

Converse, Inverse, Contrapositive - Regent Prep Oswego NY |

Flash cards For Logic Unit - Quizlet |

Venn Diagrams - Annenberg Learner |

Parallel & Perpendicular Lines - Unit 3

Alternate Interior, Alternate Exterior, & Corresponding Angles, Interior Angles on Same Side of Transversal, Proving Lines Parallel & Perpendicular, Slopes |

Parallel Line and Pairs of Angles - Math is Fun |

Slope of a Line - Math Open Reference |

Congruent Triangles - Unit 4

Classifying Triangles by Sides and Angles, Sum of Angles of Triangles – Angle Sum Theorem, Exterior Angle Theorem, Congruent Triangles- Name Corresponding Parts, Proving Congruence – SSS, SAS, ASA, AAS, HL, & CPCTC |

Exterior Angles of Triangles - Regent Prep Oswego NY |

Notes on Triangles - Cliffs Notes |

SAS Triangle Congruency |

Triangles & Their Relationships - Unit 4B

Isosceles and Equilateral Triangles – Properties, Perpendicular Bisectors, Angle Bisectors, Medians, Altitudes of Triangles, Concurrency, Centroid, Incenter, Circumcenter & Orthocenter |

Isosceles Triangle Theorem - Regent Prep Oswego NY |

Concurrence - Regent Prep Oswego NY |

Inequalities & Triangles - Unit 5

Triangle Inequality – Largest Side and Largest Angle, Range for length of side of a triangle, Inequalities Involving Two Triangles – SAS, SSS, Triangle Inequality Theorem, Shortest Distance Between a Point and a Line |

Triangle Inequalities - Regent Prep Oswego NY |

Triangle Inequalities Proof - Basic Mathematics |

Triangle Inequality Theorem - Math for Morons Like Us |

Similarity - Unit 6

Ratios, Proportions – Properties and Scale Factors, Similar Polygons, Similar Triangles – AA, SSS, SAS, Parallel Lines & Proportional Parts – Divides Segments into Parts, Proportional Parts - Corresponding Perimeter, Medians, Altitudes & Angle Bisectors have same ratio, Proportional Parts of 1 Triangle – Angle Bisector divides one side into proportional parts |

SAS Similarity - Geogebra |

Similar Triangles - Math is Fun |

Theorems about Similar Triangles |

Right Triangles - Unit 7

Geometric Mean, Rationalize the denominator, Parts of a Right Triangle, Altitude is geometric mean, Leg is geometric mean, Pythagorean Theorem and Converse, Special Right Triangles: 30–60–90 and 45–45–90 |

Pythagorean Theorem & 30-60-90 & 45-45-90 - Cool Math |

Special Triangles - Math for Morons Like Us |

Trigonometry - Unit 7B

Sine, Cosine, Tangent, Finding measure of angle, Angles of Elevation & Depression |

Basic Trig Definitions - Cool Math |

Sine, Cosine, Tangent - Math is Fun |

Quadrilaterals - Unit 8

Angles of Polygons, Interior Angles Sum, Exterior Angles Sum, Compare and Contrast the Properties, Diagonals, Altitudes, and Medians of Quadrilaterals, Parallelograms, Rectangles, Rhombi, Squares, Trapezoids and Kites |

All Kinds of Kites - Geogebra |

Interior Angles of Triangles - Cool Math |

Interior Angles of Triangles - Math is Fun |

Quadrilateral Properties - Math Teacher |

Circles - Unit 9

Parts, Circumference, and Arc Length, Angles and Arcs – Major Arc, Minor Arc, Semicircle, Central Angle, Arcs and Chords, Tangents, Inscribed Angles Secants, Tangents, and Angle Measures, Special Segments in Circles |

Length of an Arc - Khan Academy |

Parts of Circles - Cool Math |

Transformations - Unit 10

Reflections – Lines of Symmetry and Point of Symmetry, Translations, Rotations, Regular Tessellations, Dilations – Enlarge, Reduce, or Congruent Transformation – Scale Factor |

Line Symmetry - Annenberg Learner |

Rotation Symmetry - Annenberg Learner |

Symmetry - Math is Fun |

Transformations - Math is Fun |

Area, Surface Area, & Volume - Units 11, 12, & 13

Area of Parallelograms, Triangles, Trapezoids, and Rhombi, Area of Circles and Sectors, Three Dimensional Figures and Nets, Surface Area & Volume of Prisms, Cylinders, Pyramids, Cones & Spheres, Similar Solids |

3D Objects - Shmoop |

Prisms, Pyramids, Cylinders, Cones - Math Planet |

Prisms, Pyramids, Cylinders, Cones - Regent Prep Oswego NY |

Surface Area of a Cylinder - Math Open Reference |

Video on Volume and Surface Area of a Sphere - About.com Mathematics |