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- Gate 1/Pre-algebra
- 3rd Grade Worksheets
- Greatest Common Factor & Least Common Multiple
- Decimals
- Decimals Puzzle
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- Algebra Review 1
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- Gate 3/Geometry
- Geometry Introduction
- Angle Properties
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- Special Quadrilaterals 1
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- Logic and Reasoning
- Always Sometimes Never
- Congruent Triangles Topics
- Proofs & Postulates 0
- Proofs & Postulates 1
- Proofs & Postulates 2
- Diagramless and Detour Proofs
- Indirect Proofs
- Equidistance Theorem
- Parallel Lines Cut by Transversals
- Planes Properties and Proofs
- Triangle Median Altitude Bisectors
- Midpoint and Distance
- Similarity and Proportions 1
- Similarity and Proportions 2
- Similarity and Proportions 3
- Similarity and Proportions 4
- Means Extremes and Right Triangles
- Pythagorean Theorem & Distance
- Pythagorean Theorem 2 (more questions)
- Area and Perimeter of Polygons 1
- Area and Perimeter of Polygons 2
- Area and Perimeter of Complex Shapes
- Area of Shapes (Honors)
- Surface Area
- Volume
- Surface Area and Volume (Advanced)
- Circles Introduction
- Circles and Geometry
- Circles and Inscribed Figures
- Circles Review (Honors)
- Circles Review (Advanced)
- Circles Practice Test
- Word Problems
- Coordinate Geometry 1
- Coordinate Geometry 2
- Coordinate Geometry 3 Drawing Exercise
- Coordinate Geometry 4 - Advanced
- Locus of Points
- Geometry Construction Videos 1 - Intro
- Geometry Construction Videos 2- Intermediate
- Geometry Construction Videos 3- Advanced
- Geometry Review 1
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- Geometry Review 4
- Geometry Review 5 Midterm
- Gate 4/Trigonometry
- Angle Measurement
- Arc Length & Sector Area
- Right Triangle Review
- Trigonometry Introduction
- Word Problems
- Unit Circle and Trigonometry Functions
- Inverse Trig Values
- Law of Sines and Cosines I
- Law of Sines and Cosines II
- Law of Sines and Cosines III
- Navigation
- Periodic Functions I - Sine (Graphs)
- Periodic Functions II - Cosine
- Periodic Functions III - Tangent
- Periodic Functions IV - Reciprocals
- Periodic Inverse Functions
- Periodic Trig Function Models
- Trig Identities I - Introduction
- Trig Identities II - Double Angles
- Trig Identities III - Solving and Graphing
- Trig Identities IV - Review Test
- Trig Identities V - Honors
- Polar Coordinates and Complex System
- Polar Equations and Graphs
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- Trigonometry Review 1
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- Trigonometry Review 4
- Gate 5/Algebra II
- Algebra I/Geometry Review
- Algebra II Preview
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- Graphing II - Translation, Reflection, & Rotation
- Graphing III Identifying Functions
- Graphing Functions Videos
- Absolute Value Graphing Topics
- Double Absolute Values
- Composite Functions Topics
- Quadratics Overview
- Completing the Square & Quadratic Formula
- Identifying Quadratic Equations from Points
- Quadratics Practice Test
- Comparing Equations
- Modeling Word Problems
- Polynomials: Factors, Roots & Theorems I
- Polynomials: Factors, Roots, & Theorems II
- Polynomials: Factors, Roots, & Theorems III (Honors)
- Solving Rational Equations
- Sketching Rational Expressions I
- Sketching Rational Expressions II
- Reciprocal Functions
- Direct and Inverse Variation
- Word Problems
- Conics I - Circles & Ellipses
- Conics II - Hyperbolas and Parabolas
- Conics III - Review Properties
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- Conics V - More Advanced
- Conics VI - Honors Topics
- Rotation of Axes
- Analytic Geometry
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- Matrix I Examples
- Matrix II and Determinants
- Matrix III Coordinate Geometry
- Imaginary and Complex Numbers
- Rational Exponents & Radical Equations
- Variable Exponents and Higher Roots
- Exponents and Exponential Equations (Honors)
- Logarithms and Exponents I
- Logarithms and Exponents II
- Logarithms and Exponents III (Advanced)
- Growth Decay Interest & Half-Life
- Logarithms Practice Test
- Combinations, Permutations, & Counting
- Sequences & Series I
- Sequences & Series II
- Sequences & Series III
- Binomial Expansion Theorem
- Math Induction
- Parametric Equations
- Vectors I
- Vectors II
- 3 Dimensional Space and Vectors
- 3-Dimensional Space and Sketches
- Partial Fractions
- Algebra II Notation & Operations Puzzle
- Algebra II review 1
- Algebra II review 2
- Algebra II review 3
- Algebra II review 4
- Algebra II review 5
- Algebra II review 6
- Algebra II review Equations and Inequalities
- Pre-Calculus Advanced Questions
- Gate 6/Calculus
- Algebra II/Trig Practice Exam
- Limits and Asymptotes
- Definition of Instantaneous Rate of Change
- Continuity & Differentiability
- Intro to Derivatives
- Derivative Rules: Product/Quotient, Chain & Power
- Derivative Rules: Trigonometry Functions
- Chain Rule
- Derivative Rules: Log, Exponents, & Trig functions
- Applications of derivatives
- Mean Value Theorem
- Derivative max/min word problems
- Critical Values from Derivatives
- Sketching Graphs 1: 1st and 2nd derivatives
- Sketching Graphs 2: anti-derivatives
- Position Velocity Speed Acceleration
- Implicit Differentiation
- Related Rates of Change
- Using Derivatives in Economics
- Intro to Integrals
- Antiderivatives and Integrals
- Fundamental Theorem of Calculus (Part 1)
- Trapezoid Rule
- Definite Integrals & Fundamental Theorem of Calculus (Part 2)
- Definite Integrals Concepts and Applications
- Definite Integrals and Area Between Curves
- Natural log and e
- Improper Integrals
- Volumes of Solids 1
- Volumes of Solids 2
- Arc Length
- Trig Substitutions
- Separable Differential Equations
- Using Integrals in Economics
- Series Convergence and Divergence
- Calculus Extras
- Calculus Review 1
- Calculus Review 2
- Calculus Review 3 AP Multiple Choice
- Calculus Review 4 AP Free Response
- Calculus Review 5 AP Multiple Choice 2
- Gate 7/Statistics
- Airport Terminal 2
- Gate A/Instant Answers
- Math Resources: Definitions
- Math Resources: Community Help
- Math Resources: Calculators
- TI nspire cx cas calculator tutorial 0
- TI nspire cx cas calculator tutorial 1
- TI nspire cx cas calculator tutorial 2
- TI nspire cx cas calculator tutorial 3
- TI nspire cx cas calculator tutorial 4
- TI nspire cx cas calculator tutorial 5
- TI nspire cx cas calculator questions
- TI nspire cx cas calculator project 1
- TI nspire cx cas calculator project 2
- TI nspire cx cas calculator project 3
- TI nspire cx cas calculator project 4
- TI nspire cx cas calculator project 5
- TI nspire cx cas calculator project 6
- Gate B/ACT/SAT Topics
- ACT subjects to know
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- ACT/SAT Quick Quiz 1
- ACT/SAT Quick Quiz 2
- ACT/SAT Quick Quiz 3
- ACT/SAT Quick Quiz 4*
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- ACT Practice Test 1
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- ACT Practice Test 3
- ACT Practice Test 4
- ACT Practice Test 5
- ACT Geometry Practice Test 1
- ACT Trigonometry Practice Test 1
- SAT Practice Test 1
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- SAT Practice Test 3
- SAT Practice Test 4*
- SAT Practice Test 5
- Challenging ACT/SAT practice test 1
- Challenging ACT/SAT practice test 2
- ACT Hidden Message Puzzle 1
- ACT Hidden Message Puzzle 2
- Overview & Random Suggestions
- SAT Subject Test Level 2 Topics to know
- SAT Math Level 2 Practice Test A
- SAT Math Level 2 Practice Test B
- SAT Math Level 2 Practice Test C
- SAT Math Level 2 Practice Test D
- SAT Math Level 2 Practice Test E
- SAT Math Level 2 Practice Test F
- SAT 2 Hidden Message Puzzle
- Gate C/Math Places around the Virtual World
- Gate D/Webcomics
- Math Comics Archive (Fall 2011)
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- Gate E/Destinations
- Travel Checklist
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- 2012 Puzzle
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- Spare Parts
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- About Us
- 2013 US Road Trip with Oscar the Dog
- 2013 US Road Trip with Oscar (Part II)
- 2014 US South Road Trip with Oscar
- 2014 US Summer Road Trip with Oscar (East)
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- 2015 Summer Road Trip with Oscar (Canada West)
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- 2017 Summer Road Trip with Norway the Husky (US - Canada East)
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- 2019 US South Road Trip with Norway the Husky
- 2019 Summer Road Trip with Norway the Husky (around Lake Michigan)
- 2021 Summer Road Trip with Norway the Husky (The Heartland)
- 2022 Winter Road Trip with Norway the Husky (Route 66)
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Postulates and Proof Examples
The following are geometry proof examples, offering steps and explanations. Also, there is a list of useful tools and link to a "proofs exercise".
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Download Free Geometry Proofs and Postulates Examples .pdf file
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Connections
Teach, review, or explore graphing topics related to the xy coordinate plane. Try a sample, or download a packet of cartesian coordinate cartoons. Thanks for your support!
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Information
- Postulate vs Proof
- vertical, corresponding, and alternate interior angles
- parallel lines & transversal
- Median/Angle Bisector
- Isosceles Triangle
- Parallelogram
- Diagonals
- CPCTC (Corresponding Parts of Congruent Triangles are Congruent)
- SAS, SSS, ASA, HL
- Perpendicular Lines & Right Triangles
- Auxilary line segments
- All radii are congruent
- overlapping triangles
- diagramless proof
- "No choice" Theorem / AAS
