Formula

[pwmsmith]

How do you write this formula in Revit,

x=(w/2)squared + (h)squared / 2*h

Already looked at the help files but still need some assistance.
Thanks

[aaronrumple]

=(w/2)^2 + h^2 / 2*h

[pwmsmith]

Aaron,

I set a parameter for "h" and for "w" in my family.
Input the fomular and receiving error of "inconsistent units".
What are they talking about?

[aaronrumple]

Are you after area or lenght?

[pwmsmith]

What I'm trying to do is create an arch window family that is controlled by the spring point and apex of the arch, not the radius. In other words I want to define the arch with the vertical height of the arch and the width. However I know of no way to do this without using the formula :

chord= 2 * (sqrt of (2yr-ysquared)
where y =the vertical height from the midpoint of the chord to the apex and r=radius.


The sketch is to make the formula work prior to investing time making the family.

[aaronrumple]

No formula needed. Just a clever application of a couple of invisible lines and tangent arcs.

[SkiSouth]

Check out these threads.
This one uses the formula you are thinking of:

http://forums.augi.com/showthread.php?t=10109&highlight=eyebrow

This one uses locked lines:
http://forums.augi.com/showthread.php?t=5867&highlight=arch+window