Find the value of the polygon. the polygon has 6 interior angles 2 of them are y and 4 of them are (2Y-20)

First we need to determine what the 6 angles must add to. Turns out we use this formula

S = 180 (n-2)

where S is the sum of the angles (result of adding them all up) and n is the number of sides. In this case, n = 6. So let's plug that in to get

S = 180 (n-2)

S = 180 (6-2)

S = 180 (4)

S = 720

The six angles, whatever they are individually, add to 720 degrees. The six angles are y, y, 2y-20, 2y-20, 2y-20, 2y-20,

They add up and must be equal to 720, so let's set up the equation to get ...

(y) + (y) + (2y-20) + (2y-20) + (2y-20) + (2y-20) = 720

Let's solve for y

y+y+2y-20+2y-20+2y-20+2y-20 = 720

10y-80 = 720

10y-80+80 = 720+80

10y = 800

10y/10 = 800/10

y = 80

Now that we know the value of y, we can figure out the six angles

angle1 = y = 80 degrees

angle2 = y = 80 degrees

angle3 = 2y-20 = 2*80-20 = 140 degrees

angle4 = 2y-20 = 2*80-20 = 140 degrees

angle5 = 2y-20 = 2*80-20 = 140 degrees

angle6 = 2y-20 = 2*80-20 = 140 degrees

and that's all there is to it