Manual of Plane Geometry On the Heuristic Plan With Numerous Extra Exercises
Manual of Plane Geometry On the Heuristic Plan With Numerous Extra Exercises
G Irving George Irving Hopkins
The book Manual of Plane Geometry On the Heuristic Plan With Numerous Extra Exercises was written by author G Irving George Irving Hopkins Here you can read free online of Manual of Plane Geometry On the Heuristic Plan With Numerous Extra Exercises book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Manual of Plane Geometry On the Heuristic Plan With Numerous Extra Exercises a good or bad book?
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The area of a sector is equal to one-half the product of its arc and radius. 526. The areas of similar segments are in the same ratio as the squares of their radii, the squares of their diameters, and as the squares of their chords. 527. Let us designate the circumference of a circle whose diameter is unity by v, and the circumference of any other circle by C ; its diameter by D ; its radius by R ; and its area by A. -' Then 0:ir::D:l. Why? Hence I. O = 7rZ>; C 1 whence II. = TT, or III. C = 7r...x2#. TD Multiplying both members of this equation by, we have CR But, by 524, = the area of the circle ; hence 2 IV. A = 116 PLANE GEOMETRY. 528. Hence the area of any circle is equal to the square of its radius multiplied by the constant quantity TT, and the circumfer- ence of every circle is equal to the product of its diameter (or twice its radius) by the same quantity IT. From II. Above, it is readily seen that TT is the ratio of the circumference of any circle to its diameter, or of a circumfer- ence to its radius.
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