2007SEP6.txt

A = pt -1.381 0.160  
B = pt 0.806 0.192  
D = mdpt A B 
ab = line A B 
perp ab B  
M = pt l100 0.790 1.804  
circ D A  
C = pt c100 0.519 0.862  
line M D  
line C A  
N = pt l102 l101  
line M C  
E = pt ab l103 

"angle DBN = angle BCE"