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geometry.pre-college

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11/15/17

Re: Which constructions to include?

Your site is rather nice for all the constructions it includes. A lot of work you put into it! I do,

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Re: Which constructions to include?

Your site is rather nice for all the constructions it includes. A lot of work you put into it! I do,

11/15/17

8/20/17

Re: Euclidean problem

> Hi, > > I've some troubles trying to prove this problem: > > Given a square (

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Re: Euclidean problem

> Hi, > > I've some troubles trying to prove this problem: > > Given a square (

8/20/17

4/14/17

Re: Pure mathematics

Sounds like you use point slope for a,c then just use the negative reciprocal of the slope of said

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Re: Pure mathematics

Sounds like you use point slope for a,c then just use the negative reciprocal of the slope of said

4/14/17

Aditya Guha Roy

4/13/17

Re: IMO 2014 'Easy' Geometry Problem

Alternately one could see the art of problem solving (aka AoPS) website to see some very elegant

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Re: IMO 2014 'Easy' Geometry Problem

Alternately one could see the art of problem solving (aka AoPS) website to see some very elegant

4/13/17

Kitimbo Jackson

2/25/17

Pure mathematics

ABCD is a rhombus.A is the point (2,-1),and C is the point (4,7).find the equation of the diagonal BD

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Pure mathematics

ABCD is a rhombus.A is the point (2,-1),and C is the point (4,7).find the equation of the diagonal BD

2/25/17

1/2/17

Integral of a^x - Exponential Function

Integral of a^x - Exponential Function https://youtu.be/WF55MYN74Yc

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Integral of a^x - Exponential Function

Integral of a^x - Exponential Function https://youtu.be/WF55MYN74Yc

1/2/17

1/2/17

Integral of logaX - Logarithmic Function

Integral of logaX - Logarithmic Function https://youtu.be/5sVFrfp10oM

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Integral of logaX - Logarithmic Function

Integral of logaX - Logarithmic Function https://youtu.be/5sVFrfp10oM

1/2/17

1/2/17

Integral of LnX - Natural Logarithmic Function

Integral of LnX - Natural Logarithmic Function https://youtu.be/lac7E06DREk

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Integral of LnX - Natural Logarithmic Function

Integral of LnX - Natural Logarithmic Function https://youtu.be/lac7E06DREk

1/2/17

1/2/17

Integral of e^x - Exponential Function

Integral of e^x - Exponential Function https://youtu.be/cu2wdHkf5NQ

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Integral of e^x - Exponential Function

Integral of e^x - Exponential Function https://youtu.be/cu2wdHkf5NQ

1/2/17

1/1/17

Integrals of Inverse Trigonometric Functions (updated)

Integrals of Inverse Trigonometric Functions - arcsin, arccos, arctan, arccot, arcsec, arccsc with

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Integrals of Inverse Trigonometric Functions (updated)

Integrals of Inverse Trigonometric Functions - arcsin, arccos, arctan, arccot, arcsec, arccsc with

1/1/17

KC LEUNG, Awadhesh2

12/30/16

Proof of Integration by Parts with an example - x^2 arctan x dx

Hi. I have seen very nice. Can you share more related to education.

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Proof of Integration by Parts with an example - x^2 arctan x dx

Hi. I have seen very nice. Can you share more related to education.

12/30/16

12/28/16

Derivatives of Inverse Trigonometric Functions

Derivatives of Inverse Trigonometric Functions - arcsin x, arccos x, arctan x, arccsc x, arcsec x,

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Derivatives of Inverse Trigonometric Functions

Derivatives of Inverse Trigonometric Functions - arcsin x, arccos x, arctan x, arccsc x, arcsec x,

12/28/16

12/27/16

Integrals of Inverse Trigonmetric Functions

Integrals of Inverse Trigonometric Functions with verifictations - arcsin x, arccos x, arctan x,

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Integrals of Inverse Trigonmetric Functions

Integrals of Inverse Trigonometric Functions with verifictations - arcsin x, arccos x, arctan x,

12/27/16

Michael de Villiers

10/3/16

Transformations proofs of 3 circle geometry theorems

The following dynamic, interactive sketch gives transformation proofs for three basic circle geometry

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Transformations proofs of 3 circle geometry theorems

The following dynamic, interactive sketch gives transformation proofs for three basic circle geometry

10/3/16

Michael de Villiers

10/1/16

Hierarchical classification of Quadrilaterals

Some here might be interested in my interactive, dynamic, hierarchical classification of

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Hierarchical classification of Quadrilaterals

Some here might be interested in my interactive, dynamic, hierarchical classification of

10/1/16

Michael de Villiers2

2/1/11

Sum of Interior Angles of Polygons: A general Formula, and other updates

Perhaps it's necessary to point out that this general formula for the sum of interior angles of a

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Sum of Interior Angles of Polygons: A general Formula, and other updates

Perhaps it's necessary to point out that this general formula for the sum of interior angles of a

2/1/11

1/13/11

Ideas for Geometry projects

Need ideas?: http://coffeeshopsnet.blogspot.com/2011/01/storyboarding-lcds.html Free/open/copyleft.

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Ideas for Geometry projects

Need ideas?: http://coffeeshopsnet.blogspot.com/2011/01/storyboarding-lcds.html Free/open/copyleft.

1/13/11

Michael de Villiers

12/19/10

Special: Some Adventures in Euclidean Geometry

The 3rd revised edition of my book "Some Adventures in Euclidean Geometry" focuses on

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Special: Some Adventures in Euclidean Geometry

The 3rd revised edition of my book "Some Adventures in Euclidean Geometry" focuses on

12/19/10

12/16/10

Re: 9, 10, 11, 12 sided figures are called.....

good job! your on ur way to being a GOOD GOOD KID

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Re: 9, 10, 11, 12 sided figures are called.....

good job! your on ur way to being a GOOD GOOD KID

12/16/10

12/13/10

Can a geometrical figure be more than 360 degrees?

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Can a geometrical figure be more than 360 degrees?

12/13/10

Allan Turton, Prof. Lu2

11/25/10

Concave deltahedra with less than 12 faces

I have developed a method to create n-deltahedra recursively. The number of n-deltahedra for n<=12

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Concave deltahedra with less than 12 faces

I have developed a method to create n-deltahedra recursively. The number of n-deltahedra for n<=12

11/25/10

Allan Turton, Michael de Villiers7

11/20/10

Inclusive and exclusive definitions... again!

Just recently experienced another area with an assignment for some teachers where a hierarchical

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Inclusive and exclusive definitions... again!

Just recently experienced another area with an assignment for some teachers where a hierarchical

11/20/10

Allan Turton, … Michael de Villiers3

11/5/10

FW: Inclusive and exclusive definitions... again!

Hi Allan You might be interested in visiting this link on my website where I suggest ideas to develop

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FW: Inclusive and exclusive definitions... again!

Hi Allan You might be interested in visiting this link on my website where I suggest ideas to develop

11/5/10

8/25/10

Re: Heart inscribed in a circle

> > Have you or has anyone done the opposite? Ie, > > circumscribed a given heart shape

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Re: Heart inscribed in a circle

> > Have you or has anyone done the opposite? Ie, > > circumscribed a given heart shape

8/25/10

8/19/10

Suggested student project (spatial geometry)

Could be a Youtube, might use stop-action animation: http://www.4dsolutions.net/satacad/martianmath/

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Suggested student project (spatial geometry)

Could be a Youtube, might use stop-action animation: http://www.4dsolutions.net/satacad/martianmath/

8/19/10

Stuart, Mary Krimmel2

8/18/10

Heart inscribed in a circle

Have you or has anyone done the opposite? Ie, circumscribed a given heart shape with a circle?

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Heart inscribed in a circle

Have you or has anyone done the opposite? Ie, circumscribed a given heart shape with a circle?

8/18/10

ou, janis, Mary Krimmel4

7/22/10

6 points in R3 conjecture

> I now see that 20 is indeed the maximum, that an > example is easy to find, that my intuition

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6 points in R3 conjecture

> I now see that 20 is indeed the maximum, that an > example is easy to find, that my intuition

7/22/10

7/12/10

Aristotle was Right!

Followup: DMY Sommerville documented four tetrahedral space-fillers in his 1923 paper, Space-Filling

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Aristotle was Right!

Followup: DMY Sommerville documented four tetrahedral space-fillers in his 1923 paper, Space-Filling

7/12/10

5/27/10

Re: Rhoad Geometry for Enjoyment and Challenge

Hello Mr. Benson, I know it's been about 15 years from your post but I am going to reply any way.

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Re: Rhoad Geometry for Enjoyment and Challenge

Hello Mr. Benson, I know it's been about 15 years from your post but I am going to reply any way.

5/27/10

3/24/10

Re: Hyperbolas in Nature

You could do much the same with magnetism instead of electricity. Diffraction of light around a sharp

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Re: Hyperbolas in Nature

You could do much the same with magnetism instead of electricity. Diffraction of light around a sharp

3/24/10

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