AB ( 9-1 ; 6-6) AB(8;0)
AC(10-1; 9-6) AC(9;3)
S (ABC) = 1/2 | ABxAC | = 1/2 | ( 8*3-9*0) | = 12
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AB ( 9-1 ; 6-6) AB(8;0)
AC(10-1; 9-6) AC(9;3)
S (ABC) = 1/2 | ABxAC | = 1/2 | ( 8*3-9*0) | = 12