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feet of altitudes of triangle. 
the Brocard points. 
Bocard’s Ist triangle. 
Brocard’s 2d triangle. 
centre of the nine points circle. 
Nagel’s point. 
associated Nagel points. 
Nagel’s triangle. 
Schwatt’s triangle. 
Tarry’s point. 
Steiner’s point. 
mid-points of the arcs of the cireumcircle subtended by the 
sides of the triangle. 
opposite points from A’B/C’ on circumcircle. 
Gergonne point. 
the associated Gergonne points. 
the sides of the triangle. 
the three altitudes. 
the medians. 
radius of incircle. 
radius of excircle. 
2 (a+b-+c). 
s—a,s—b, s—e. 
radius of circumeircle. 
area of triangle. 
