Elements of Geometry Containing the First Six Books of Euclid With a Supplemen
Elements of Geometry Containing the First Six Books of Euclid With a Supplemen
John Playfair
The book Elements of Geometry Containing the First Six Books of Euclid With a Supplemen was written by author John Playfair Here you can read free online of Elements of Geometry Containing the First Six Books of Euclid With a Supplemen book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Elements of Geometry Containing the First Six Books of Euclid With a Supplemen a good or bad book?
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y ELEMENTS OF GEOMETRY. SUPPLEMENT. BOOK FIKST. OP THE QUADEATURE OF THE CIRCLE. DEFINITIONS. I. A cliord of an arc of a circle is the straight line joining the ei- remities of the arc ; or the straight line which subtends the arc. II. The perimeter of any figure is the length of the line, or lines, by which it is bounded. AXIOM I. The least line that can be drawn between two points is a straight line ; and if two figures have the same straight line for their base, that which is contained withi...n the other, if its bounding line or lines be not anywhere convex towards the base, has the less perimeter. Cor. 1. Hence the perimeter of any polygon inscribed in a circle is less tlian the circumference of the circle. Cor. 2. If from a point two straight lines be drawn touching a circle, these two lines are together greater than the arc inter- cepted between them ; and hence the perimeter of any polygon described about a circle is greater than the circumference of the circle, AXIOM II. The space which is greater than any polygon that can be inscribed in a given circle, and less than any polygon that can be described about it, is equal to the circle.
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