Help with parameters

[malonicivil1]

Hi! I need some help searching for a solution to put parameters in this family of Revit so that changing the biggest radius it all maintains tangent to each other circunferences. Thanks.

 

[L.Maas]

You will have to look at math formulas. When you modify the radius of the big circle you will have to calculate the internal tangent of the smaller circle. With a formula of a parameter you can reposition this smaller circle to get it tangent again. Because two circles can have internal tangents on many position, you will have to decide in which direction the smaller circle should move. So think about constraints.

So check math sites and look for internal tangents to learn more about the formulas

[barthbradley]

[ToanDN · Accepted solution]

Try this family.