Relative coordinates: when drawing a new segment using the relative coordinate system, the next point is referenced from which location?
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A0,0
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Bthe ending point of the last line
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Cthe beginning point of the last line
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Dnone of the above
Answer
Correct Answer: the ending point of the last line
Explanation
Introduction / Context:CAD offers absolute, relative, and polar-relative entry methods. Relative coordinates (using the @ prefix) are indispensable for constructing chains of geometry without computing global coordinates each time.
Given Data / Assumptions:
- You are continuing a polyline or line segment sequence.
- You choose to enter @dx,dy for the next point.
- Or you use @r
Concept / Approach:Relative coordinates are measured from the last picked/entered point. This allows fast layout of rectangles, bolt patterns, and offsets by simply keying the deltas or distance-angle pairs.
Step-by-Step Solution:
Finish or pick the last point of the current entity.Enter @dx,dy to move by deltas in X and Y from that last point.Alternatively, enter @distanceVerification / Alternative check:Use ID or Properties to confirm the new endpoint equals the last point plus the entered deltas.
Why Other Options Are Wrong:
- 0,0: That is absolute origin, used for absolute coordinates, not relative.
- Beginning point of the last line: Relative is from the most recent endpoint, not the start of the previous entity.
- None of the above: Incorrect because option B is correct.
Common Pitfalls:Forgetting the @ prefix results in absolute input; always include @ for relative coordinates.
Final Answer:the ending point of the last line