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 Regular Pentagon (Classic) (Posted on 2003-05-15)
Show, how given a distance r, one can construct a regular pentagon, whose circumradius is r, using only ruler and compass...

Note 1: The ruler doesn't have any marks, so it's no good for measuring. It's only good for joining 2 points by a line.

Note 2: The circle which circumscribes the polygon, such that the polygon lies entirely within the circle and all of whose vertices lie on the circumference of the circle is the circumcircle of the polygon. The radius of this circle is the circumradius of the circle.

 See The Solution Submitted by Fernando Rating: 3.0000 (5 votes)

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 re: Solution | Comment 6 of 17 |
(In reply to Solution by Ravi Raja)

A compass is not a protractor. It can't measure angles.
 Posted by Charlie on 2003-05-16 03:20:26

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