# Law of Cosines

• November 19th 2009, 12:41 PM
ryno16
Law of Cosines
Use the law of cosines to solve the triangle

C=108°
a=10
b=7
• November 19th 2009, 12:52 PM
11rdc11
Quote:

Originally Posted by ryno16
Use the law of cosines to solve the triangle

C=108°
a=10
b=7

$c^2 = a^2 + b^2 -2(a)(b)\cos{C}$

just plug in the values and solve