Straightedge and Compass
Euclid Postulate 1, 2, and 3.
- To draw a straight line from any point to any point.
- To produce a finite straight line continuously in a straight line.
- To describe a circle with any center and distance.
Don't forget the straightedge and compass. The straightedge and compass in the mind are as useful for creating proofs as the straightedge and compass in the hand, or the formal system.
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