An Introduction to Geometry and the Science of Form: Prepared from the Most Approved Prussian Text-Books (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from An Introduction to Geometry and the Science of Form: Prepared From the Most Approved Prussian Text-Books

Two straight lines may make 1, 2, or 4 angles, (fig. Three straight lines, if they meet at 1 point, may make at least 2, at most 6 angles, (fig.

If they meet at 2 points, they may make at least 2, at most 8 angles; they cannot make 7 angles, because 3 angles cannot be formed at one point by 2 straight lines.

If they meet at 3 points, they make at least 3, at most 12 angles; but never 11 angles.

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