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**Puzzled** Sorry, pretty much in a rush to finish this soon as I have been stuck at understanding this vectors chapter for a really long time. I hope someone will be able to help with it...I've tried but I really cannot figure it out alone.

The line L has cartesian equations $\displaystyle x - 2 = \frac{y - 5}{2} = -z$. Find the perpendicular distance from the origin to L.

Find also the acute angle between L and the z-axis.

I don't know what concepts I am missing out on but I am stuck.

Help will be much appreciated. I'm trying to learn and not just get answers. Rushing on revision as I don't have much time...planning to finish my math revision in 2 months.