Home > Shapes > Geometry
| Hajja's Rational Cosine (Posted on 2005-03-02) |
 |
Prove that the angles of a triangle all have rational cosines if and only if the triangle is similar to one with rational sides.
|
|
Submitted by owl
|
|
No Rating
|
|
|
Solution:
|
(Hide)
|
|
Hint: One direction uses the law of cosines and the other use the law of sines. |
Comments: (
You must be logged in to post comments.)
|
|
Please log in:
Forums (0)
Newest Problems
Random Problem
FAQ |
About This Site
Site Statistics
New Comments (3)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On
Chatterbox:
|
