The cosine rule
The cosine rule
For the following triangle, the cosine rule is as follows:
a² = b² + c² – 2bc cos A (this formula can be used to find side lengths)
this can also be written as:
cos A = b² + c² – a² / 2bc (this formula can be used to find angles)
You may also like
-
The sine rule
16 October, 2016 -
Area of a triangle using ½ab sin C
16 October, 2016 -
Graphs of trigonometric functions
16 October, 2016