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Question

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


A

medians of the triangle A1,A2,A3 are concurrent;

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B

the triangle A1,A2,A3 is right angled atA3;

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C

the triangle A1,A2,A3 is an equilateral triangle;

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D

altitudes of the triangle A1,A2,A3 are concurrent.

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