Question 400480
Cosine Law: {{{c^2 = a^2 + b^2 - 2abcosC}}}
==> {{{c^2 = 10^2 + 4.5^2 - 2*10*4.5cos105}}}
==> {{{c^2 = 143.5437141}}} ==> c = 11.981, to 3 decimal places.