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Mathematics: How long is C side in triangle 







Hi.
Write the formula and explanation of calculating the C side of triangle below in picture?
 changed: mat (2.8.2012 ob 03.59.45) 









The angle opposite to the c side is called γ (greek letter for gamma) and the formula to calculate the c side of a triangle is:
c² = a² + b²  2ab cos(γ)
c = sqrt (a² + b²  2ab cos(γ))
c = sqrt (9² + 10²  2*9*10 * cos(55))
c = sqrt (81 + 100  180 * 0.57)
c = sqrt (81 + 100  102.6)
c = sqrt (78.4)
c = 8.85 cm
I think it's right that way, you just picked some weird values. 





