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" The area of a circle is equal to the product of its circumference by half the radius.* Let ACDE be a circle whose centre is O and radius OA : then will area OA— ^OAxcirc. "
Elements of Geometry, Conic Sections, and Plane Trigonometry - Page 124
by Elias Loomis - 1877 - 443 pages
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Life at West Point: The Making of the American Army Officer: His Studies ...

Harrie Irving Hancock - 1902 - 340 pages
...equal to 10 feet; find its area. Define "limit of a variable." Illustrate by an example. Prove that the area of a circle is equal to the product of its circumference by half the radius. Angles at the centres of equal circles are proportional to what? Angles at the centres of unequal circles...
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Complete Graded Arithmetic: Third grade-[eighth grade], Volume 8

George Edward Atwood - Arithmetic - 1902 - 168 pages
...triangles, the sum of whose bases is the circumference of the circle, and whose altitude is the radius. The area of a circle is equal to the product of the circumference and half the radius. Half the radius is a fourth of the diameter. The area of a circle...
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Preston-Stevens Standard Arithmetic, Book 2

DeForest A. Preston, Edward Lawrence Stevens - Arithmetic - 1910 - 380 pages
...its center to its circumference. 30. The circumference of a circle is 3.1416 times its diameter. 31. The area of a circle is equal to ^ the product of its diameter and its circumference. It is also equal to .7854 of the square of its diameter. age of its...
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The Measurement of Teaching Efficiency

Felix Arnold - Teachers - 1916 - 302 pages
...altitude. (2) The area of any triangle is eqiial to half the product of its base T)y its altitude. (3) The area of a circle is equal to the product of the square of its radius X 3.1416. (4) The circumference of a circle is equal to the product of its diameter X 3.1416. (5) The...
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Plane Geometry

Edith Long, William Charles Brenke - Geometry, Modern - 1916 - 292 pages
...7.5, 8. Give results in tabular form, taking the approximate value of IT, first 99 269. Theorem X. The area of a circle is equal to the product of its circumference by one-half of its radius. Given the circle C with circumference c and radius r. To prove that area of...
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Plane Geometry

Edith Long, William Charles Brenke - Geometry, Plane - 1916 - 292 pages
...7.5, 8. Give results in tabular form, taking the approximate value of TT, first 99 269. Theorem X. The area of a circle is equal to the product of its circumference by one-half of its radius. Given the circle C with circumference c and radius r. To prove that area of...
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Rapid Arithmetic: Quick and Special Methods in Arithmetical Calculation

Thomas O'Conor Sloane - Arithmetic - 1922 - 214 pages
...the circle; this is to find the side of the square equal in area to the circle of any given diameter. The area of a circle is equal to the product of the square of the radius by ir. For a circle of the diameter, 1, this area is .7853982 .... The side of a square...
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Rapid Arithmetic: Quick and Special Methods in Arithmetical Calculation

Thomas O'Conor Sloane - Arithmetic - 1922 - 208 pages
...the circle; this is to find the side of the square equal in area to the circle of any given diameter. The area of a circle is equal to the product of the square of the radius by IT. For a circle of the diameter, 1, this area is .7853982 .... The side of a square...
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Bobbs-Merrill Arithmetics, Volume 3

Raymond Asa Kent, Martha C. Olsen, James R. Skiles - Arithmetic - 1927 - 462 pages
...remembering that the area of any triangle is found by multiplying its base by ^ its altitude; we may say : The area of a circle is equal to the product of its circumference multiplied by -5 its radius. Problems 1. If your bicycle wheel has a diameter of 30 inches how many...
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Encyclopedia of the History of Arabic Science, Volume 2

Régis Morelon - Science - 1996 - 430 pages
...product of its semi-perimeter and the semi -diameter of the inscribed circle, al-Khwarizmi explains that the area of a circle is equal to the product of its semi-diameter and the semi-circumference. For the ratio T of the circumference to its diameter al-Khwanzml...
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