Exercise - 11.1 If a line makes angles 90°, ...

NCERT Class XII Mathematics Chapter - - Solutions

Question : 1 of 78

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Exercise - 11.1

If a line makes angles 90°, 135°, 45° with the x, y and z-axes respectively, find its direction cosines.

Solution:

Required direction cosines are < cos90°, cos135°, cos45°> i.e.,

\langle 0, -\frac{1}{\sqrt{2}}, \frac{1}{\sqrt{2}} \rangle

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