find the value of the polygon. the polygon has 6 interior angles 2 of them are y and 4 of them are (2Y-20)
1 answer:
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, <span> They add up and must be equal to 720, so let's set up the equation to get... (y)+(y)+(</span>2y-20)+(2y-20)+(2y-20)+(<span>2y-20) = 720 Let's solve for y </span>y+y+2y-20+2y-20+2y-20+2y-20 = 720 10y-80 = 720 10y-80+80 = 720+80 <span>10y = 800 </span> 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 <span>angle2 = y = 80 degrees </span><span>angle3 = 2y-20 = 2*80-20 = 140 degrees </span>angle4 = 2y-20 = 2*80-20 =<span> 140 degrees </span><span>angle5 = 2y-20 = 2*80-20 = 140 degrees </span>angle6 = 2y-20 = 2*80-20 =<span> 140 degrees </span> and that's all there is to it
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