How do I find the magnitude on only 2 axis?

I am remaking the old roblox skateboards, but I need to find the magnitude of the velocity of only the x and z axis, not the y axis. How do I do this?

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√(x^2 + z^2) is what you’re looking for.

You can derive this from the original equation for magnitude:
√(x^2 + y^2 + z^2) where the y value is 0.

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