# User:Rscott3

Summer 2011

```Some important pages for me to remember: S11, Page Building Help, Image Pages by Field of Mathematics, Wiki Tricks
- why is there not a link to the image page list?
```

Rscott testing $2 + 2 = 4$

## May 16 Notes

### Possible Page topics:

• Specific fractal types
• Klein Bottle
• wheat on the chessboard/grains of rice problem
• Other famous problems
• absent-minded professor?
• ambiguous triangles

### Questions

• contacting Sweet Briar:
• Would it be helpful for one of us to stay in touch with the summer researchers there?
• Is there a page we can build/ look at that would show everything that they'll be putting up so we don't have any overlap?
• What do we do about pages like Fractals?

## May 17 Notes

Starting Topic Ideas:

1. Law of Sines
• Geometry
• Basic Description
• formula = a/sinA = b/sinB
• use it to solve oblique triangles
• introduce/mention the ambiguous case
• Historical background: not much info found in initial research, but there's definitely enough for a few sentences
• Why it's important
• Real Life Application: Surveying Land
• Surveyors can use the law of sines to help calculate the perimeter/ dimensions of a plot of land.
• Earthquakes and triangulation
• A More Mathematical Explanation
• Two Different Proofs
• use area formula to derive law of sines
• use the formula for sine to derive the rest to
• The Ambiguous Case, include demonstration/applet
• other applications in mathematics
• Law of sines for tetrahedra
• law of sines in the spherical/hyperbolic case
• the value given by a/sinA is the diameter of the circumcircle, that is the circle whose boundary contains all three vertices of the triangle
• Heron's/Hero's formula
• A= <no wiki>[s(s-a)(s-b)(s-c)]^(1/2)(/no wiki)
• s= (a+b+c)/2 is the semi perimeter of=r half of the perimeter
• Teaching resources
• Teaching Activity for the ambiguous case with string
• Challenges/Shortcomings
• Too simple a topic? Target site audience?
• Finding a good picture/image to represent this topic
• may have to make applet?
2. Normal Distribution
• Statistics?
• Intro
• Basic Description
• the center of the normal distribution is the mean, what standard deviation means in terms of the bell curve
• commonly referred to as Bell Curve
• Origin: de Moivre used this as an original approximation for binomial distribution
• used later by Gauss and Laplace
• talk about different transformations and interpretations of the different variations of the bell curve
• A More Mathematical Explanation
• Mathematical Proof
• Integrate under this curve to get 1
• total probability can be no larger than 1
• talk here about inference testing and how we measure overall significance using normal distribution
• comparing different normal distributions to one another
• why it's important
• real life-example: SAT is graded on bell curve

• Probability
• Basic Description
• In a group of 23 people, there is more than a 50% chance that two people within that group have the same birthday
• there's a 99% chance with 57 people in the room
• there's a 100% chance with 366 people in the room
• A More mathematical Explanation
• Calculate the probability that a match will not occur and then subtract from 1
• Pigeonhole Principle explains the 100% certainty at the 366 person level
• ex: with a set of unmatched black and white socks, picking three will guarantee that you pick at least one pair of matching socks
• Challenge/shortcomings
• needs some sort of picture/image

## May 25 Notes

1. make Law of sines a helper page
2. make new helper page of same format for law of cosines
1. derive/prove formula
2. example
3. extensions?
1. researching today