Three points $(x_1, y_1)$, $(x_2, y_2)$, $(x_3, y_3)$ are collinear if and only if:
A$x_1 = x_2 = x_3$
BThe area of the triangle they form is zero
C$y_1 = y_2 = y_3$
DThey have equal sum of coordinates
Answer & Solution
Correct answer: B. The area of the triangle they form is zero
Three collinear points form a degenerate triangle with **zero area**.
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