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a flat intersects with unknown tilt angle a Cartesian coordinate system into it's origin. Let's suppose the flat "rising" from negative Z values. We know:

- vertical angles between flat and X, Y axis, let's suppose 10° each;

- horizontal angle between tilt direction and axis. Because the vertical angles between flat and X, Y axis are identical this angle will be 45°;

I'd like to know how to calculate the angle between the flat formed by X and Y axis of the reference system, and the ideal stright line representing the tilt direction.

I hope I was clear....english is not my native language... .

Thank's in advance for your time.

Raffaele

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# Tilt angle for a flat

Can you offer guidance or do you also need help?

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