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# equal area constraint in sketch? Genius
In NX sketcher, various constraints provide a very flexible tool to control the size dependence of geometries.

I know that a triangle can be used to constrain the length of two lines to a fixed ratio.

Since long I'm thinking about whethe it's possible to constrain the area of two sketch geometries to be equal, using ONLY geometric constraints but NOT expressions. E.g. the square and the rectangle in the figure below. If this is possible, the lengths (a, b, c) of three lines can be constrained to: a×a=b×c

Hope to have some clues from you. Thanks! 4 REPLIES 4

# Re: equal area constraint in sketch?  Siemens Phenom
This is not possible, but a good ER candidate.
Regards, **bleep**

# Re: equal area constraint in sketch? Genius

Hi @DickBaardse   Thanks! If it's impossible, let me forget it and settle on the use of expressions.

# Re: equal area constraint in sketch? Valued Contributor

NX can use a spreadsheed to calculate data. There is a function in Excel called "Goal Seek".

The spreadsheet can do the work for you to find a parameter combination for area2 to make it the same size as area1.

Excel changes a parameter, checks if it is now closer to a required solution, and changes the parameter again.

Wolfgang

# Re: equal area constraint in sketch? Genius

I would need to learn how to manage data with spreadsheet in NX first. Thanks for the information!