Step-by-step explanation:
If the two chords are congruent, then they must be equidistant from the centre of the circle. 
Answer: <u><em>D) They must be perpendicular</em></u>
A is rejected because the chord might not pass through the center of the circle.
B is rejected because the chords are not obligated to be parallel.
C is rejected because it is not compulsory for the chords to be perpendicular. 
 
        
                    
             
        
        
        
6 is the greatest common factor of 24,30,42
        
             
        
        
        
Answer:
19/25 * 100 = 76%
Step-by-step explanation:
 
        
             
        
        
        
Area is 3.6*3.6*pi
Area is 12.96 pi
        
             
        
        
        
Hope this helps you. Thank you....