Answer:
m∠F = 100
Explanation:
Sum of interior angles in a hexagon is 720.
( x - 60 ) + ( x - 40 ) + 130 + 120 + 110 + ( x - 20 ) = 720
x + x + x - 60 - 40 - 20 + 130 + 120 + 110 = 720
3x - 120 + 120 + 130 + 110 = 720
3x + 130 + 110 = 720
3x + 240 = 720
3x = 720 - 240
3x = 480
x = 480 / 3
x = 120
m∠F = x - 20
Substitute the value of x,
m∠F = 120 - 20
m∠F = 100