Using Object Snap and relative coordinates

When making a rectangle, one length is often known while the other is based on other objects in the drawing (think of a 1" wide flat bar whose length matches something in the drawing).

After picking the base point, can I locate the 2nd point using object snap (.x) for the length and than relative dimension (y = 1" from base y) for width.  I can't figure it out on my own.

Thanks,

Marty

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