When you sketch a rectangle there is two types of line color appear black lines and blue lines. Solidworks recognize black lines as a fully define line and blue lines as under defined line. So what the differences?
a) Black line is defined line by its location and dimension attach to it. Black line is locked entities and will not move if you tray to drag it to another positions.
b) Blue line is under defined because it’s free from its position and no dimension given to it. This line normally not locked and drag able.
Let’s give it a try, sketch a rectangle start from origin;
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