Question 600994
c^2 = a^2 + b^2 - 2ab*cos(C)


c^2 = 8^2 + 8^2 - 2*8*8*cos(12)


c^2 = 64 + 64 - 128*cos(12)


c^2 = 128 - 128*cos(12)


c = sqrt( 128 - 128*cos(12) )