Mathematics - Conic Sections

Complete the crossword, then click "Check Answers". If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to begin the crossword. Note that two-word answers exist too.
             1     
2       3             
                
     4             
                
  5                
            6      
7                  
         8         
   9               
                
    10              
                
    11