 | William Dodds - 1883 - 198 pages
...area of a sector is 616 sq. ft., the angle of the sector is 10° ; what is the radius ? 119. Since the area of a circle is equal to the product of half the diameter and half the circumference (Art. 101), therefore the area of a sector, which is a portion of a circle,... | |
 | Albert Taylor Bledsoe - Mathematics - 1886 - 253 pages
...an infinite number of sides." * The same principle is employed to demonstrate the proposition that " the area of a circle is equal to the product of half its radius by the circumference." Nor is this all. All the most important and beautiful theorems, relating... | |
 | James Morton - Mathematics - 1887 - 236 pages
...number of sides. If a regular hexagon be inscribed in a circle, its side will be equal to the radius. The Area of a Circle is Equal to the Product of Half the Radius by the Circumference. Let ACDE be a circle whose centre is O and radius OA ; then will area... | |
 | Wm. M. Peck - 1894 - 310 pages
...SOAcres. NW i 160 Acres. st 330 Acres. The circumference of a circle is about 3}- times the diameter. The area of a circle is equal to the product of half the circumference by the radius; or the product of the diameter by itself, multiplied by .7854. In measuring... | |
 | Daniel Barnard Hagar - Arithmetic - 1871 - 352 pages
...expressed approximately by 3^-, or by 3.1416; and of the diameter to the circumference, by ^, or .3183. 2. The area of a circle is equal to the product of half the circumference by half the diameter. 3. The area of a circle is also equal to the product of the square... | |
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... base. For the area of a circle is equal to the product of half the diameter into half the circumference ; (Art. 
