Question

The points (0, –1, –1), (–4, 4, 4), (4, 5, 1) and (3, 9, 4) are

• A. Collinear
• B. Coplanar
• C. Forming a square
• D. None of these

Answer 1

Answer: (B)

Coplanar

Answer 2

Equation of the plane passing through the points

(0, –1, –1), (–4, 4, 4) and (4, 5, 1) is $\left| \begin{array} { c c c } x & ( y + 1 ) & ( z + 1 ) \\ - 4 & 5 & 5 \\ 4 & 6 & 2 \end{array} \right| = 0$ …. (1)

The point (3, 9, 4) satisfies the equation (1)