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What is Polar Snap Tracking in CAD and how to use it?

The dimensions we see in most drawings are about angles and length, few of us would dimension coordinates. When drawing, we tend to use Object Snap or just enter the length and when the lines of graphic objects are orthogonal, we can just use ORTHO. But what if there is a fixed or regular angle, such as 30 degrees, 45 degrees, 60 degrees. That’s what Polar tracking used for.

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