Posted by **TT** on Friday, March 26, 2010 at 10:00pm.

Given that a measures 25.1 mm, x measures 51.2 mm and angle b measures 82°, find the length of y -

- Math - Trig -
**MathMate**, Friday, March 26, 2010 at 10:07pm
If y is the third side of a triangle, you could use the cosine rule, where

a,b are lengths of adjacent sides, and C is the included angle between a and b.

then the length of the third side, c, is given by:

c²=a²+b²-2ab cos(C)

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