# Geometery help.

Discussion in 'Off Topic [BG]' started by Toasted, Jun 29, 2005.

1. ### Toasted

May 26, 2003
Leeds, UK
If a circle has a diameter of 15cm, what is the length of each side of a regular octogon that fits within the same circle?

2. ### dlloydzzzzzzzzzzzzzzz

Apr 21, 2004
Scotland
5.74cm

Edit:

Think of it as eight identical isosceles triangles (with sides AB=AC=7.5cm and angle BAC=45 degrees) joined together at angle BAC.

sin(45/2)=(BC/2)/7.5

3. ### Toasted

May 26, 2003
Leeds, UK

Are you sure? Because if not all the easter eggs you buy from tesco are going to fall over in their boxes? yes, its that important.

4. ### dlloydzzzzzzzzzzzzzzz

Apr 21, 2004
Scotland
I don't shop at Tescos. But, yes, I'm 100% sure.

I even drew one in powerpoint to check...

Edit: Are you sure you wanted the octagon inside the circle?

5. ### Toasted

May 26, 2003
Leeds, UK
Yup. Thanks David That's much appreciated

Apr 13, 2001
berkeley, ca
yeah, checked it myself. it's good. (the next digit is 0, so the rounding is even more accurate than i'd expected.)

looks like those eggs will be sittin' pretty.

7. ### dlloydzzzzzzzzzzzzzzz

Apr 21, 2004
Scotland
What are you doing with easter eggs anyway?

8. ### DigMe

Aug 10, 2002
Waco, TX
What if you stack the eggs? What if they're duck eggs? Huh? HUH? Answer that, Poindexter!

9. ### cheezewizSupporting Member

Mar 27, 2002
Ohio
Who cares? Real people don't need geometry. (Unless they are engineers or other geeky types)

10. ### Hollow ManSupporting Member

Apr 28, 2003
Springfield, VA
I'm an electrical engineer, and I use geometry all the time.

Of course, the next time my boss asks me to cram an octagon into a sphere, I'm outta here.

11. ### AaronS

Hey! I'm married to an engineer. She may be a geek, but she is a kick@ss stride piano player. I thought I'd be able to demonstrate that some of us in the Colonies have an education, but David beat me to it. Have you discussed the octagonal egg cross section with the hens. Mine would be quite disturbed to be informed about that modification.

12. ### DigMe

Aug 10, 2002
Waco, TX
I think it's ok to know geometry. The main thing is just to avoid putting all your eggs in one basket.

Apr 13, 2001
berkeley, ca
in my high school calc class, when we were covering the mean value theorem for derivatives, the teacher gave us an example of cops using it to catch drivers speeding.

i did not believe that this was an actual practice.

so, can you settle this for once and for all?

14. ### cheezewizSupporting Member

Mar 27, 2002
Ohio
LOL! Nah..it's not actual practice. I just use a radar gun when I write the rare speeding ticket.

For the record, there is nothing wrong with geometry. I just always sucked at math so I must make fun of those who don't.

Apr 13, 2001
berkeley, ca
i figured as much.

i figured as much.

16. ### dlloydzzzzzzzzzzzzzzz

Apr 21, 2004
Scotland
Heh! You just feel inadequate compared to us manly types who can integrate a function. Erm, or something.