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


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 - Mathematics