construction project, inscribed equilateral triangle in a circle. please help

belvadeer64 · #1 $Old$ May 18th, 2009, 03:48 PM

so basically my project is on constructing a 3-dimensional octahedron.
we construct it by creating circles with a six inch diameter and an inscribed equilateral triangle in each.
there are three folds to glue together on each,
my question is how do you find the area of the inscribed triangle,
the area of the sector, and the segment?

please help with anything you know, i really appreciate it.

this is to show you what it looks like:

http://i41.tinypic.com/28a88cp.jpg

[IMG]file:///C:/DOCUME%7E1/Owner/LOCALS%7E1/Temp/moz-screenshot.jpg[/IMG][IMG]file:///C:/DOCUME%7E1/Owner/LOCALS%7E1/Temp/moz-screenshot-1.jpg[/IMG]

earboth · #2 $Old$ May 18th, 2009, 11:31 PM

Quote:

Originally Posted by belvadeer64 $View Post$

so basically my project is on constructing a 3-dimensional octahedron.
we construct it by creating circles with a six inch diameter and an inscribed equilateral triangle in each.
there are three folds to glue together on each,
my question is how do you find the area of the inscribed triangle,
the area of the sector, and the segment?

please help with anything you know, i really appreciate it.

...

For a start have a look here: Find area of a 'curved triangle'