Difference between revisions of "Law of Cosines"

(See also)
Line 9: Line 9:
 
==See also==
 
==See also==
 
* [[Pythagorean Theorem]]
 
* [[Pythagorean Theorem]]
* [[Law of Sines]]
+
* [[Law of sines]]
 
* [[Trigonometry]]
 
* [[Trigonometry]]

Revision as of 15:24, 29 June 2006

The Law of Cosines is a formula used in finding lengths and angles of a triangle. For sides a, b, and c with opposite angles A, B, and C respectively:

$c^2 = a^2 + b^2 - 2ab\cos C$

$b^2 = a^2 + c^2 - 2ac\cos B$

$a^2 = b^2 + c^2 - 2bc\cos A$

See also

Invalid username
Login to AoPS