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September 3, 2014

September 3, 2014

Posted by **Tommy** on Saturday, March 3, 2012 at 4:25pm.

Side RA=4

Side AB=4.8

Side RB=7.1

How do I find Angle RAB?

Thanks!

- Math -
**bobpursley**, Saturday, March 3, 2012 at 4:29pmLaw of Cosines

C^2=a^2+b^2-2abCosC

so label your sides a, b, c

you want angle c to equal RAB

so RB=C

RA=a

AB=b

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