The interior angles formed by the sides of a hexagon have measures that sum to 720 degrees. what is the measure of angle f?

Sum of interior angles of polygon = (n - 2) x 180
in this case n = 6
so (6 - 2 ) x 180 = 4  x 180 = 720

x - 60 + x - 40 + 130 + 120 + 110 + x - 20 = 720
3x + 240 = 720
3x = 480
  x = 160

m<F = x - 20 = 160 - 20 = 140

answer
<F = 140°

(m+11n)^2=(m+11n)(m+11n)=m^2+11mn+11mn+121n^2=m^2+22mn×121n^2 for example; use foil: (a+b)(a+b)first. a^2outside. abinside. ablast. b^2