The distance of the point (15,8,13) from the z-axis is ___.

13 units

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15 units

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17 units

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23 units

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Solution

The correct option is C
17 units

The distance of a point P(x,y,z) from the z-axis is
$d = \sqrt{x^{2} + y^{2}} = \sqrt{15^{2} + 8^{2}} = \sqrt{225 + 64} = \sqrt{289} = 17 u n i t s$

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