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c^2 = a^2 + b^2 - 2 ab cos alfa
cos (30stopni) = p(3)/2
p(3) to jest pierwiastek z 3, tylko nie wiem jak wstawic znak pierwiastka
wiec:
c^2 = (4p(6))^2 + (6*p(2))^2 - 2(4p(6)*6p(2))*p(3)/2
c^2 = 16*6 + 36*2 - 48*p(6*2*3)/2 = 96 + 72 - 24*6 = 168 - 144 = 24
c = pierwiastek z 24 = 2p(6)