Question

Coordinates of four points A, B, C, D are respectively (a, 2, 1) ; (1, –1, 1) ; (2, –3, 4) and

(a + 1, a + 2, a + 3). If AB = 5 and CD = 6 then a is equal to –

• A. 1
• B. 5
• C. 3
• D. –3

Answer 1

Answer: (D)

–3

Answer 2

& AB = 5 \Rightarrow a = - 3,5 \\ & CD = 6 \Rightarrow a = - 3,1 \end{aligned} \right\}\therefore commonsolutionisa = - 3$$