NDA Government Jobs Exams

What is the area of the triangle whose vertices are (0, 0, 0), (1, 2, 3) and (–3, –2, 1) ?

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NDA Other Question

The sum of the direction cot of x-axis is What is the distance between the planes x – 2y + z – 1 = 0 and –3x + 6y – 3z + 2 = 0 ?