Three Dimensional Geometry
NCERT Exemplar Class 12
CBSE
Grade 12
Question:
Distance of point $(1, 2, 3)$ from y-axis is:
(a) $\sqrt{10}$
(b) $\sqrt{13}$
(c) $\sqrt{5}$
(d) $2$
Step-by-Step Solution
Foot on y-axis is (0, 2, 0). d = \sqrt{1^2 + 0^2 + 3^2} = \sqrt{10}. [1.0 Mark]
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🎯 Official CBSE Marking Scheme:
Selecting $\sqrt{10}$: 1.0 Mark
Correct Answer: $\sqrt{10}$
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