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COSINE RULE
 
Formula:

COSINE RULE
Description: rule for general triangles
Syntax: a = SQRT(b^2 + c^2 - 2*b*c*COS(α))
/* "α" means the plane angle opposite to the side "a". If you know all lengths of the sides of the triangle, you can calculate the angle "α" opposite to the side "a" as follows:
COS(α) = (b^2 + c^2 - a^2) / (2*b*c)
alpha = ACOS((b^2 + c^2 - a^2) / (2*b*c) ) */
Note:

This rule shows the relation between a side of a triangle and the angle opposite to it.
Category: Mathematics / Trigonometry
Creator: Physics
Account: Free
Published: 14 July 2010
Tags: triangle plane angle cosine

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