Appetizers and Lessons for Mathematics and Reason (www.whyslopes.com)
||Définition d'une variable || Algèbre || Arithmetique || Logique ||La raison basée sur les règles et modelés||

Online Volumes
1,  Elements of Reason.
1A. Pattern Based Reason 
1B. Math Curriculum Notes
2. Three Skills for Algebra
3. Why Slopes & More Math

 (Optional Book Orders)
More Site Areas 
1. Help Your Child or Teen Learn 
2. Solving Linear Equations
3. Fractions Ratios Rates Proportions & Units
4. Euclidean Geometry
5. Analytic Geometry/Functions 
6. Number Theory
7. More Calculus
More Site Areas 
8. Complex Numbers 
9. Qc Maths  Education  
10. Secondary IV(?) maths
11. Real  Analysis 
12. LaTeX2HotEqn:
13. Electric Circuits Etc  
14.  Français
15. Algebra, Odds & Ends, Etc
More Site Areas 
16. Math Education Essays
17. Telling & Working with Time
18. Maps, Plans & Drawings
19. Quantitative Skills for  home, shopping and work 
20. Statistics Useful, or Not.

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YOU are better than YOU think. Show yourself  how:  

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Read  logic chapters 1 to 5  in online volume Three Skills for Algebra  for greater skills & confidence in  work 
and study

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 Logic chapters 1 to 5  re- appear not in sequence, as is or longer,  in  Volume 1A,  Pattern Based Reason, Bon Appetite.

Logic Mastery
 Amazing, Amusing, Amorous,  Delicious, Delightful, Edifying, Strengthening Elixir. 
It eases work & learning difficulties Makes the hard easier. Opens eyes. Leads to greater precision.
in reading and
writing

Logic mastery makes the hard, easier. Logic mastery  leads to better, stronger and richer comprehension.  Logic mastery  improves reading and writing.  Logic mastery ease learning difficulties.  Logic mastery gives a headstart.  In sum, logic mastery  will develops critical thinking, improve reading and writing, and give a firmer base for work and studies at many levels. Good luck.


After logic  (a) continue reading Three Skills for Algebra, chapters 8 to 14  and do so alongside site area on solving liinear Equations ; or (b) see this calculus starter lesson and Volume 3, Why Slopes  & More Math, chapters 2 to 6;

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Caution: Site advice is approximately correct, for some circumstances, not all. That leaves room for thought

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What may be learnt and when depends on how skills and concepts are developed. Making the hard easier and clearer will allow earlier & richer development of skills and concepts.


Try the Twiddla Whiteboard. In principle, it  allows to people to draw and chat together online on a copy of this webpage or a clean sheet. The chat may be via text or audio.  Visit www.twiddla.com to set up whiteboards to work with the webpage of your choice.

For online automated help in senior high school maths & calculus, visit  quickmath.com  For Automatic Calculus and Algebra Help with derivatives, integrals, graphs, linear equations, matrix algebra, visit calc101.com  With  overlap, each site quickmath & calc101offers a different range of services, some free, some not, all based on webmathematica. Good luck.

Parallel Lines 

In other words, the postulate assumes the sum of interior angles for that transversal between two lines sum to 180 degrees (two right angles) when and only when the lines are parallel. 


Theorem: Corresponding Angles for a transversal between two lines when and only when the sum of interior angles for that transversal sum to 180 degrees (two right angles)

Proof:

Here = 180 degrees. Now (corresponding angles equal) implies gamma + beta = 180 degrees. The latter in turn implies the two lines are parallel.  

Conversely, if the two lines  are parallel, then  = 180 degrees. The latter along with = 180 degrees (due to their being components of a straight angle) gives So corresponding angles are equal. 


The above theorem immediately implies the foregoing.

TheoremCorresponding Angles for a transversal between two lines when and only when the lines are parallel.

Theorem: Alternative angles for a transversal between two lines when and only when the lines are parallel.

Proof: If alternating angles and are equal then + = 180 degrees implies +   = 180 degrees. So the sum of interior angles on one side of the transversal sum to 180 degrees.  When the lines are parallel. 

Conversely, If the two lines are parallel then  + + 180 degrees combined with +=180 degrees gives = . So alternate angles are equal.  


Parallel Postulate (Alternative View)

The angle side angle method fails to construct a triangle on both sides of the segment if the sum of the angles is a straight angle.

The parallel postulate may be stated as follows: Two lines will not intersect if the sum of interior angles on any side of a transversal sum to two right angles. 

Equivalent ways of implying the sum of interior angles for a transversal equal a straight angle are follows.

  • alternate angles equals
  • corresponding angles equal
  • sum of exterior angles equal a straight angle, two right angles or 180 degrees)
Equivalent ways of saying sum of interior angles on one side of a transversal is less than a straight angle.   
  • sum of exterior angles exceed a straight angle
  • alternate angles are not equal - does not specify the side
  • corresponding angles are not equal - does not specify the side

 

 

www.whyslopes.com
4. Euclidean Geometry

Advice & Directions
This Revisited
Correspondence
Isometry
Side-Side-Side
Side Angle Side
Angle-Side-Angle
Isoceles
SSS Failure
SAS Failure
ASA Failure
Parallel Lines
Angle Sum
Similarity
Right Triangle Similarity
Trig  or Similarity
Parallelograms
Arrows & Vectors
Links
Prep for Analytic Geometry


Above Average Students in Geometry may enjoy  the site geometric introduction of complex numbers and the wordy volume 1A,  Pattern Based Reason.

For algebra, logic starter lessons,  see Volume 2, chapters 1 to 12, plus 14, 16 and 17.

Analytic Geometry, Functions & Trig

(FN) What are Functions?
(FN) Functions - More
SZM: Sign, Zero, Monoticity
(L) Lines Summary
(P) Polynomials (*,+,-)
(Q) Quadratics
(D) Simplify Square Roots
(T) Unit Circle Trig
Conic Sections


More For Analytic Geometry:

Real Numbers
Say More Positive
Linear Inequalities
Triangle Inequality
Absolute Value |x|
|x| Eq'ns & Inequalities
Rectangular Coords
Shortest Path
Distance Formulas
Add & Multiply Points
Polar Coordinates
Radians
(A) Vectors
(A) Coordinate Arithmetic
(A) Navigation on Maps
(A) Addition Geometrically
(A) Rotation
(PT) Translations
(PT) Dilatations
PT: Rotations

Easy Consequences of  this (newest) Complex Number. Starter Lesson follow below to provide an alternate development of HS or college maths.

Vec & Cmplx  No Applet
B2 C. Conjugates
B3 Pythagoras
B4 Distance
B5 Rt Triangle Similarity
B6 Trig., Functions
B7 Dot & Cross Products
B8 Cosine Law
B9 Exponential & cis fns
B10 Easy Trig Identities
B11 Set Viewpoint

Lesson Plans and lessons

Secondary I - fractions & allied concepts (decimals, percentages)

Secondary II - Algebra  (arithmetic versus algebraic methods, backward use of formulas and proportionality equations)

Secondary IV - Functions to Trig & Statistics

Calculus Intro 

Algebra Lesson Notes - All levels

Great_Expectations: If you can learn to follow a multi-step methods in any subject precisely, you can do so in other subjects, as well.

Good news: Site pages  identify what you need to study.

Bad news: Site pages do not explain everything  

Worse news: Learning takes time, yours

 


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a 1983 McGill. Ph. D. in mathematics
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