A(-1,2), B(5,-1), C(8,5)
Pole prostokąta :
P=a·b=6·9=54
Pole trójkąta :
P₁=1/2ah=1/2·6·3=3·3=9
P₂=1/2ah=1/2·6·3=3·3=9
P₃=1/2ah=1/2·9·3=1/2·27=13,5
PΔABC=P-P₁-P₂-P₃
PΔABC=54-9-9-13,5
PΔABC=22,5
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A(-1,2), B(5,-1), C(8,5)
Pole prostokąta :
P=a·b=6·9=54
Pole trójkąta :
P₁=1/2ah=1/2·6·3=3·3=9
P₂=1/2ah=1/2·6·3=3·3=9
P₃=1/2ah=1/2·9·3=1/2·27=13,5
PΔABC=P-P₁-P₂-P₃
PΔABC=54-9-9-13,5
PΔABC=22,5