the distance of the point (3,6,8)from x-axis is_______ a) 3 b)6 c) 10 d)square root of 109
You have not clearly mentioned the coordinates of the point on the x-axis from which the distance to the point (3, 6, 8) is to be calculated. If the question is "Find the shortest distance of the point (3, 6, 8) from the x-axis", then @ Rakhi: has given the correct answer. Well done.
The shortest distance of the point (3, 6, 8) from the x-axis is the perpendicular distance to the x-axis from (3, 6, 8). The perpendicular from (3, 6, 8) to the x-axis intersects on it at the point (3, 0, 0).