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posted by danielle Friday, July 29, 2011 at 4:05pm.

use the law of cosines to solve the triangle A=55 degree, c=10, b=3

a^2 = 10^2 + 3^2 - 2(10)(3)cos55° = 109 - 60cos55 = 107.8528.. a = 10.3852..

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