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on mouseUp
   -- calculate radius of cone in feet
   put 6 into treeHeight
   put 4 into treeBase
   put treeBase / 2 into radius

   -- calculate cone volume in cubic feet
   put radius * radius * pi * treeHeight / 3 into coneVolume

   -- calculate surface area of cone in square feet
   put radius * radius * pi + radius * pi * sqrt(radius^2 + treeHeight^2) into coneSurfaceArea

   -- calculate number of needles using surface area and needles per square foot
   put coneSurfaceArea * 1000 into needleCount
   answer "There are approximately " & round(needleCount) & " needles on your Christmas tree."
end mouseUp