Geometry
posted by Troy .
You are given two segments, AB with AB = 4 and CD with CD = 7. You want to construct a new segment, EF with EF = 1. If you can use only congruentsegments construction, explain how you would use AB and CD to construct EF.

Draw a line segment of sufficient length
Set your compass to length AB.
Mark off two segments of length AB on the new line. Call the endpoints E and G. EG has length 4+4=8.
Set the compass to the length of CD, or 7.
Place the compass at G and mark a point on EG between E and G. Call that F.
GF = 7, and EF = 1
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