Making multiple different polygons the same height

[Anonymous]

I am attempting to make 4 different solids of constant width, a triangle, a pentagon, a heptagon, and a nonagon. These all need to be the same height in order ro roll togther. Unfortunely, none of the polygon tools allow for creation using one side and one corner, so they come out different heights. Is there any way around this?

[rohit.bapat]

Hello @Anonymous

Could you please post an image or some representation of what you are trying to achieve?

Thank you,

Rohit Bapat

[etfrench]

Create one of the polygons with the desired height. Create the others with any height (Use the same orientation for all of the polygons).  Use the Scale command to make each polygon match the first.  Hint: You can enter a formula in the Scale Factor entry field.

p.s. You'll have to decide if you want the width or the height equal. I don't think you can have both.

[TrippyLighting]

Is this what you are looking for ?

[etfrench]

I stand corrected

[Anonymous]

Yes! Certainly! How do I do that?

[etfrench]

Look closely at @TrippyLighting's post.  He shows how to make different polygons using dimensions instead of using the Polygon tool.  This has the advantage of being (more) parametric than the polygon tool.

The following polygons were created with the Polygon tool using the Inscribed Polygon option.  The circles were created first using a rectangular pattern.

[Anonymous]

Actually, on closer examination of both the posts, it seems that the height seems to increase slightly with the number of sides. Is there a way to make it so that the distance from the middle of the bottom face to the apex of the shape is the same across different polygons?

[TrippyLighting]

Yes, of course. If you look at my screenshot agin it'll be self evident how o do that ?

[Anonymous]

Ohhhhhh I get it.

Thank you all a heap for putting up with me not getting that.

[TheCADWhisperer]

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@TrippyLighting wrote:

Yes, of course. If you look at my screenshot agin it'll be self evident how o do that ?

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It is not evident to me.

Can you File>Export and then Attach your *.f3d file here?

[TrippyLighting]

Instead of dimensioning it horizontally, you dimension it vertically .. with the equally evident consequences.

In other words it might still not do what the OP wants to do, but then the student has learned from experimenting  and IME  that knowledge usually sticks better than from being given a straight answer.

[TheCADWhisperer]

If a picture is worth a thousand words> the geometry might be worth a thousand pictures.

I understand geometry better than the word problem descriptions.

Can you File>Export  and then Attach your *.f3d file here?  (The response is a binary Yes or No).

[Anonymous]

It is indeed what I wanted.

These 3 solids of constant width will now roll smoothly supporting a flat plane.

[TheCADWhisperer]

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@Anonymous wrote:

It is indeed what I wanted...

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I do not see equivalent solutions (not considering the 60 vs 40 size)?

[Anonymous]

In both cases, the "Sketch Dimension" tool is used. In Trippy Lighting's case, the width of each different shape is the same. In mine, the height of each different shape is the same. 

(Pay attention to what way the black arrows are pointing.)