Solutions
- Draw a chord across part of the arc, and construct a perpendicular bisector of the chord. Do the same for a
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Comment: If you rip the page from the book and hold it up to the light, you can fold a section of the arc
onto itself. The crease is a perpendicular bisector of a chord. Do this again. Where the two creases intersect
is the center of the circle. - Yes. We have seen that if a and b have been constructed, then it is possible to construct a + b and also a.
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So, use the following steps to construct 123.
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Next, construct a segment of length 3.
Next, construct a segment of length 23.
Next, construct a segment of length 23.
Next, construct a segment of length 123.
Finally, construct a segment of length 123.
Lesson 27 - Verify that it does.
- In each case, they do.