Resize a rectangle

[Anonymous]

I'm trying to change this 7x4 rectangle composed of two 3.5x4 rectangles, into one 6x4 rectangle composed of two 3x2 rectangles.

My first attempt was to grab and resize the component rectangles one by one.  That didn't work at all; depending what I tried to grab, the result was either a rhombus or a trapezoid.

So instead I tried deleting the 7ft dimension along the top edge and re-add a 6 foot one.  That "technically" worked in that it reduced the length of that one edge by 1 foot, but the opposite edge didn't follow.  So, I added the same dimension to that edge, and the result was a rhombus like one of my first attempts.

Attempting to add further constraints to the sketch to force the two 4ft edges to stay parallel and thus keep the right shape only results in an error message: "The sketch is over constrained", with no further information.

So...how do you do this?  Obviously I could go back and delete the whole thing, start over, and resketch.  But what if I mess up again and need to change the dimensions?  Surely there's a way...

[TheCADWhisperer]

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@Anonymous wrote:

... into one 6x4 rectangle composed of two 3x2 rectangles.

.....

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Not physically possible.

Note that in the first example you wrote, "7x4 rectangle composed of two 3.5x4 rectangles," you halved only the 7 dimension and left the 4 as it was.

So you should edit the 7' to 6' but if you want the 6x4 you are done. 

[Anonymous]

Sorry, 3x4.  Derp.  Been fighting with FS360 too long tonight to be coherent I guess, heh.

Basically I want to scale the top edge down to 6 feet instead of 7, but not have some weird non-rectangular shape afterward.

[TheCADWhisperer]

See the file that I attached above.

You can delete the horizontal line that I put in to illustrate the 2' dimension.

In your original image you were missing a Vertical Constraint on the left and a Coincident Constraint in the lower right.