How do you calculate the area of a triangle when the question tells you the length of all three sides but no angles?

use the cosine rule to get angle A; cos(A) = (b^{2} + c^{2} - a^{2})/2bc2) Use '1/2 x a b x sin(C)' to get the area of the triangleNote: the side 'a' is the one opposite angle A