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# Thread: Length is determine by angle

1. ## Length is determine by angle

Hey guys,

Is there a way to determine the length by angle?

2. Remember when you were in high school and you said you would never use Trigonometry?

Guess what....it's trigonometry....scroll down a little, you will find a reminder on how it works.

3. Yes a very long time ago.

4. You need at least two pieces of information to be able to find the length you are seeking. Having only one angle will not suffice in using trigonometry to find the length.

5. Yes it's actually two.

6. my drawing is incorrect

7. See the attached file, it could probably be simplified but I've had a bit too much Jack Daniels to think that clearly

Anyway I added some length parameters to keep the segments the same size and it seems to work fine like a bi-fold door but I'm not sure what your purpose for this family is so my example might not suit. There is a formula which calculates the length in question and a reporting parameter for what the actual dimension is when the Angle B is adjusted to prove the formula is correct and hopefully answer your question.

8. Originally Posted by mark2009
Hey guys,

Is there a way to determine the length by angle?

Back in 2007 I posted a how-to...to create a design assist tool for slanted volumes, etc.
All one needs to know are any 2 of the 3 pieces of info (rise, run, slope) voila... the math is explained in the posting but based on the parameter names I used these are the formulae:

Run=Rise/tan(Slope)
Slope=atan(Rise/Run)
Slope Percentage=100*tan(Slope)

With the result being a component that calcs either run, slope or rise, in concert with the rest

1: Control Parameters: Rise & Slope; Run is derived from them.
2: Control Parameters:
Rise & Run; Slope is derived from them.
3: Control Parameters:
Slope & Run; Rise is derived from them.

Fear and Loathing In a CAD vs. BIM World: Slanted Volumes...I guess the Ramp tool isn't enough?

9. Mark, did bother to look at my family? It does what you are looking for. I've revised it slightly to include a restrictor so that the extreme angles don't break the family. Just change the angle of the parameter Driving_Angle and the Length changes whilst maintaining the length of the panel segments. I'm only on 2015 so I cant see what your family contains.

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