With the Segment tool, construct a segment radius of this circle from point A to any point on the circle other than point A'. This circle's radius is fixed at 2.5 cm, because you've fixed the distance between A and A' at 2.5 cm. With the Compass tool, construct a circle centered on point A passing through point A'.Delete the horizontal segment you just constructed.If you wish to construct a segment that is 2.5 cm long but has no restrictions on its orientation, follow these steps: Thus, in addition to fixing the length of the segment, you have fixed the orientation of the segment as well. This is because endpoint A' is the image of A translated by 2.5 cm at an angle of zero degrees, which is directly to the right. If you follow the above steps exactly, you'll notice that in addition to being 2.5 cm long, your segment is always horizontal. No matter how you drag either endpoint, the segment's length will remain 2.5 cm, because it has been constructed to always have that length. Now use the Segment tool to construct the segment between A and A'. Sketchpad constructs a new point A', which is the translated image of A by the distance that you entered (2.5 cm). In the Translate dialog box, enter the fixed length as the distance by which you wish to translate the point. Select point A and choose Transform | Translate.For an arbitrary length, the easiest way to do this is with the Transform menu. To fix a segment's length in Sketchpad, you need to construct the segment in such a way that dragging cannot change its length. That is, dragging an endpoint again would change it from its current length to some other length. While you could create a segment with the Segment tool, measure its length, and drag one endpoint until its length is 2.5 cm, this segment would not be constructed to be exactly 2.5 cm long. Occasionally, you may wish to create a segment of fixed length (for instance, a segment that is exactly 2.5 cm in length). FAQ: Fixed Distance How do I construct a segment of fixed length (e.g., 2.5 cm)?
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