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Windows 7: School help

09 Jan 2012   #1
Influx

Win7 Ultimate x64 SP1 / WCP x64 / Ubuntu 11 x64
 
 
School help

So, I just got silently disappointed today at school. In our geometry class, I was asked the question by my teacher: True or false, all chords of a circle contain exactly 2 points. So, I answered: false. My reason (I didn't point this out): Well, the center of a circle is a part of the circle, if a line intersects an existing point (the center of the circle in the current case), then it contains the point (i might be wrong), and a diameter is a chord. So, my mind told me to answer False since the diameter is a chord, and it intersects the center of a circle, thus containing it. My teacher had that scary look at me, and began to incorrectly explain to me that a chord contains two points. I am a very inconfident student, I only speak when I'm mad. She began to tell the class about people who think they're always right that was very sarcastic on my view.That moment, my teacher was clearly behaving unprofessionally. She even told me that I cannot accept what is said to be right. I was supposed to tell her that I am a person that believes logically, you can't just tell me something is right and that's it, you have to explain a reason. But then she continued and had that unwelcoming face. She clearly was influencing close-mindness to students, overprioritizing discipline. Anyways, even though I could be wrong, her treatment to students is clearly biased and incorrect. I just want to leave to you guys whether my answer was right or wrong, since I've just lost trust from my teacher.

Doesn't anyone care for change? Education is Important! We deserve a decent education! I have much to say, but are usually useless to say. Who cares about the future? Teachers are pure idiots, they don't purely do their jobs, they apparently don't value correctly education. youtube.com/watch?v=zDZFcDGpL4U
Can anyone help me with my question, because I'm filing a complain against that teacher?
My System SpecsSystem Spec
09 Jan 2012   #2
Dwarf

Windows 8.1 Pro RTM x64
 
 

In Geometry, all chords of a circle have exactly 2 points. A point is defined as being the position on the circumference of the circle where the line of the chord passes through. A chord that passes through the centre of a circle is its diameter.

See Chord (geometry) - Wikipedia, the free encyclopedia
My System SpecsSystem Spec
09 Jan 2012   #3
Hopalong X

Windows7 Pro 64bit SP-1; Windows XP Pro 32bit
 
 

Quote:
A chord of a circle is a geometric line segment whose endpoints both lie on the circumference of the circle. A secant or a secant line is the line extension of a chord. More generally, a chord is a line segment joining two points on any curve, such as but not limited to an ellipse. A chord that passes through the circle's center point is the circle's diameter.
http://en.wikipedia.org/wiki/Chord_(geometry)

Red highlight above added by me.
Google is our friend.

Google search box typed in > chords of a circle.
chords of a circle - Google Search

Bested by Dwarf.
My System SpecsSystem Spec
.


09 Jan 2012   #4
dreamer

Windows 8 Pro
 
 

Chord may or may not pass through the center of the circle so your argument is wrong.
My System SpecsSystem Spec
09 Jan 2012   #5
clunkfish

Windows 7 Enterprise x64
 
 

You're wrong, the teacher's right.
My System SpecsSystem Spec
09 Jan 2012   #6
kado897

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 

The center point of a circle isn't part of the circle. A circle is only the line.
My System SpecsSystem Spec
09 Jan 2012   #7
seavixen32

Windows 7 Ultimate SP1 64-Bit
 
 

Guess it's time to make your peace with your teacher.
My System SpecsSystem Spec
10 Jan 2012   #8
Influx

Win7 Ultimate x64 SP1 / WCP x64 / Ubuntu 11 x64
 
 

In Geometry, all chords of a circle have exactly 2 points. A point is defined as being the position on the circumference of the circle where the line of the chord passes through. A chord that passes through the centre of a circle is its diameter.

A diameter is a chord, it is the longest chord, it has the definition of a chord. Therefore the diameter which meets 3 points and contains them, is included in the statement "every chord".

A line segment is a series of points, not just two endpoints. The center exists, because it is necessary for the definition of the radius, therefore FALSE.
My System SpecsSystem Spec
10 Jan 2012   #9
Dwarf

Windows 8.1 Pro RTM x64
 
 

In Geometry, a point is defined as being where 2 or more lines intersect, or where a single line changes direction. For a chord and a circle, the intersection points are where the line passes through the circle, the intersecting line being that which forms the circumference of the circle. Even the diameter, or the Great Chord, holds true to this definition. Whilst it is true that the diameter passes through the centre of the circle, it still has only 2 points because, apart from its intersections with the circumference, there are no other intersections which will define a point.
My System SpecsSystem Spec
10 Jan 2012   #10
Everlong

 

Well whatever the answer is, your teacher was still being unprofessional about it all.
My System SpecsSystem Spec
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