High School Geometry Refresher?

[Chojin]

I need to measure some irregular objects here at the site for area. Some of these areas are circular, some have rounded corners. I need a refresher on my highschool geometry. Does anyone know of ways the internet could help me here?

[Esuohlim]

Rounded corners is more of a calculus thing, I think.

Try this: http://library.thinkquest.org/20991/...eo/solids.html

[Chojin]

This is pretty useful:

http://en.wikibooks.org/wiki/Geometry

Comments and suggestions are still welcome

[Chojin]

milhouse that link you gave me doesn't have anything to do with planar area, just cubic/volume/etc stuff. I'm trying to figure out square footage in rounded rooms. My link isn't being too helpful with that, either.

[RaNkeri]

I remember that circles are can be solved if you know the length of it's r

A=pi*r*r

if the other are your talking about is an ellips(sorry, don't know the english word for it), you must know it's lenght(a) and heigth(b)

then, you can solve it's area

A= pi*a*b

[Schimid]

it's all about the radius baby

[Guitar Woman]

what's with the round offices?

[DeadKennedys]

Originally Posted by Guitar Woman

what's with the round offices?

The oval office, dickhead

[Marc Summers]

THE MATH WAY

1. Complete the circle that the rounded corner would make if it kept turning.



2. Calculate the area of that circle like so:
a. Draw a straight line connecting two points of the circle, I think it's called a cord. It doesn't matter if it's directly in the center or not. Call this line A.

b. Mark the midpoint of A.

c. Draw a perpendicular line through the midpoint of A, connecting what will now be two opposite ends of the circle. Call this line B. I eyeballed this, so it's a little off ;/

d. Line B is now your diameter. Half of it is the radius, the midpoint is in the absolute center of the circle. Area is pi * r * r.



3. Draw a square that barely touches (is tangent to) the circle on all of the square's sides.



4. Area of the square is side * side, subtract the area of the circle to get the area between the circle and square.



5. Divide #4's area by 4. Exactly 1/4 of the area from number 4 is outside the curve, yet within the square.



6. Multiply #5 by 4 for the 4 rounded corners, and subtract that from the area of the shape as if it was a rectangle with points instead of curves. Ummm, I guess you could leave this and #5 alone since they basically cancel each other out, but it's good to show my work...I guess...



Rankeri is almost right about the area of an ellipse: Pi * A * B. But A is half the length and B is half the height, just like the radius is half the diameter.

Yea...I'm kinda bored right now...

[MLE]

hey i remember that now! how refreshing!

[camacazio]

I forget how to do math without calculus.

I read that with geniune entertainment. I like math.

[Supafly345]

you+me=us

[GADZOOKS]

haha, you guys were like MATH STINKS I'LL NEVER USE IT, but look at you now, you never thought a rounded table would come into your lives.

BUT THEY ALWAYS DO KIDS, REMEMBER MATH!

[DamnthatDavid]

hahah, the only reason I passed math was me copying off of Supafly.

[camacazio]

I still want to see his alleged "square wheel" model.

[The One and Only...]

Calculus makes math infinitely more enjoyable. I'm guessing that the rounded table is a function of the angle or parametric?

[kahljorn]

My penis vomitted after reading the post above mine.

[Blue Fox]

i hate math.
it was the only class i got a B in this quarter.
stupid teacher, i hope she chokes on something.

[Chojin]

Thanks for going to all that trouble, Marc, it really did help

Blue Fox, does your rearrival mean that the prophecy of George has been fulfilled and that he will return a final time to give us a thousand years of peace?