Assuming that the largest angle in the dart is A and the angle with 360 degrees to A is B, then B = the sum of all angles in the dart except Angle A.. If the graph is eight, suppose six angles are (a, b, c)(d, e, f), where c and d are diagonal, then a+b = e+f.

AB+AE is greater than BD+DE.

CE+DE is greater than CD.

So AB+AE+CE+DE is greater than BD+DE+CD.

So AB+AE+CE is greater than BD +CD.

So ab+AC > BD+BC