1.

A triangle has vertices A, (x1,y1) for i=1,2,3. Then the determinant Δ=∣∣∣∣∣x2−x3y2−y3y1(y2−y3)+x1(x2−x3)x3−x1y3−y1y2(y3−y1)+x2(x3−x1)x1−x2y1−y2y3(y1−y2)+x3(x1−x2)∣∣∣∣∣=0 means

Answer»

A triangle has vertices A, (x1,y1) for i=1,2,3. Then the determinant

Δ=

x2x3y2y3y1(y2y3)+x1(x2x3)x3x1y3y1y2(y3y1)+x2(x3x1)x1x2y1y2y3(y1y2)+x3(x1x2)

=0 means




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