ABCD is a regular tetrahedron , its sides are of equal length . E and F are the midpoints of AB and CD respectively .

I am not sure what a tetrahedron is . Can someone show me the sketch ? Thanks !!

Results 1 to 4 of 4

- Aug 17th 2009, 04:16 AM #1

- Joined
- Jan 2009
- Posts
- 381

- Aug 17th 2009, 04:22 AM #2
Hello,

type tetrahedron in google, or google image

And you'll get this, for example :

http://www.math.wichita.edu/history/...trahedron2.gif

(it's a 3-dimension structure)

- Aug 18th 2009, 04:20 AM #3

- Joined
- Jan 2009
- Posts
- 381

- Aug 18th 2009, 11:34 AM #4