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## Main Question or Discussion Point

In the below figure, i'm supposed to express the z-coordinate of the point [itex]P[/itex], [itex]z'[/itex], by the angle [itex]\theta[/itex]

Does this work out as [itex]z' = R\cdot \cos \theta[/itex]? If so, I cant see why...

Please give me a hint on this.

Does this work out as [itex]z' = R\cdot \cos \theta[/itex]? If so, I cant see why...

Please give me a hint on this.