how do you find the sum of a hexogon

1. 
   
   All sides are the same length (congruent) and all interior angles are the same size (congruent). To find the measure of the interior angles, we know that the sum of all the angles is 720 degrees (from above)... And there are six angles... So, the measure of the interior angle of a regular hexagon is 120 degrees.
   
   

i wonder how many degrees a hexagon has?

This is how you find the angle sum of any polygon. 

Start at one vertex and draw diagonals from it to each of the other vertices.

Count the number of triangles and multiply the number by 180 degrees