You use a closed dot with the greater than or less than with the line under the symbol or the greater than or equal to or the less than or equal to symbols. The line indicates a closed dot.
        
             
        
        
        
That's the beginning of Euler's number ' e '.
It falls between the square roots of  7  and  8 .
Hey !  You know what !  
It falls between the square roots of any integer 
less than  8  and any integer greater than  7 .
        
             
        
        
        
Answer:
All points on line CD are equidistant from A and B
Step-by-step explanation:
Given that point A is the center of circle A and point B is the center of circle B,  and the circumference of circle A passes through the center of circle B which is point B and vice versa. 
Therefore we have;
The radius of circle A = The radius of circle B
Which gives;
The distance of the point C to the center A is equal to the distance of the point C to the center B
Similarly, the distance of the point D to the center A is equal to the distance of the point D to the center B
So also the distances of all points on the line from the center A  is equal to the distances of all points on the line from the center B.