Question
Download Solution PDFThe sum of the direction cosines of z-axis is
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
The direction cosines of the vector are the cosines of angles that the vector forms with the coordinate axes.
Calculation:
Z-axis makes an angle 90° with X-axis, 90° with Y-axis, and 0° with Z-axis
∴ Direction cosines of Z-axis: cos 90, cos 90, cos 0
i.e., 0, 0, 1
Now sum of the direction cosine of z-axis = 0 + 0 + 1 = 1
Hence, option (3) is correct.
Last updated on May 31, 2025
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