The answer is A. 1/5 because only 1 out of the 5 possible answers has 1 pair of parallel sides.
A. 1/5
        
             
        
        
        
There is two possible conic section that can be formed when the plane intersects the vertical axis, a circle, and an ellipse. Cutting one nappe of double napped cone perpendicular to the vertical axis means the cut is straight across the cone making a right angle. The conic section formed would be a circle. 
        
                    
             
        
        
        
The slope is -1/4
hope this helped 
        
                    
             
        
        
        
Answer:
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░░░▌░▄▄▄▐▌▀▀▀░░ This is Bob
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▀█▌░░░▄░▀█▀░▀ ░░ Copy And Paste Him onto all of ur brainly answers
░░░░░░░▄▄▐▌▄▄░░░ So, He Can Take
░░░░░░░▀███▀█░▄░░ Over brainly
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do it or he will hunt you down and kill u (lets destroy the moderators!!!!!!!!)
we are slowing them down already! good work soilders!
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
1. n-5....... 2.v+3 and v- 2