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  Challenge 66: Airport Runways   Why are airport runways numbered?  
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    Board of letters  
  Airport runways are labeled with numbers at both ends. The pilot sees the signs when the plane is landing. What is the missing runway number?
airport terminal
Perimeter looking at runways
  Want a hint?
Hint: Place a zero after each runway number; then think in terms of degrees. The measure of an angle along a straight line is 180�.

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