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9 cards from this deck
All vertices away from (0,0)(0,0)(0,0)
12∣x1(y2−y3)+x2(y3−y1)+x3(y1−y2)∣\frac{1}{2}|x_1(y_2-y_3)+x_2(y_3-y_1)+x_3(y_1-y_2)|21∣x1(y2−y3)+x2(y3−y1)+x3(y1−y2)∣
Any triangle on Cartesian plane
Determinant of matrix
(x2−x1)2+(y2−y1)2\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}(x2−x1)2+(y2−y1)2
6.56.56.5 square units
424\sqrt{2}42 units
Distance formula
All triangles in Cartesian plane
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