TS EAMCET · Maths · Three Dimensional Geometry
If the angle between the lines whose direction cosines are \(\left(-\frac{2}{\sqrt{21}}, \frac{C}{\sqrt{21}}, \frac{1}{\sqrt{21}}\right)\) and \(\left(\frac{3}{\sqrt{54}}, \frac{3}{\sqrt{54}},-\frac{6}{\sqrt{54}}\right)\) is \(\frac{\pi}{2}\), then the value of \(C\) is
- A 6
- B 4
- C -4
- D 2
Answer & Solution
Correct Answer
(B) 4
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