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" To find the area of a circle, multiply the square of the diameter by .7854. "
Everyday Arithmetic - Page 222
by Franklin Sherman Hoyt, Harriet E. Peet - 1920
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The First Six Books of the Elements of Euclid, with a Commentary and ...

Euclid, Dionysius Lardner - Euclid's Elements - 1828 - 542 pages
...degree of approximation (634). The following practical rule may be derived from (634) and (636). • To find the area of a circle multiply the square of the radius by 31415, and divide the result by 10000.' This will give the area, subject to an error of less than the...
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Arithmetic made easy

A. Turnbull - Arithmetic - 1836 - 368 pages
...but any t,f the above methods will give a result sufficiently correct fur all practical purposes. 6. To find the area of a circle, multiply the square of the diameter by .7854 ; or multiply half the circumference by half the diameter ; or multiply the circumference...
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The Teacher's Assistant in the "Course of Mathematics Adapted to the Method ...

Mathematics - 1836 - 488 pages
...the number of degrees in the arc; so is the circumference of the circle, to the length of the arc. To find the area of a circle. Multiply the square of the diameter by the decimals .7854. Or, multiply half the diameter into half the circumference. Or, multiply...
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Arithmetic on the Productive System: Accompanied by a Key and Cubical Blocks

Roswell Chamberlain Smith - Arithmetic - 1841 - 324 pages
...square inscribed in a circle -.—Multiply the diameter by .707016. tr the circumference by .255079. 5. To find the area of a circle :— Multiply the square of the diameter by .785398, or tit* tquate of the circumference by .079577525. 6. Te lind the diameter of...
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Arithmetic on the Productive System: Accompanied by a Key and Cubical Blocks

Roswell Chamberlain Smith - Arithmetic - 1842 - 320 pages
...inscribed in a circle : — Multiply the diameter by .707016, or the circumference by .2251)79. 5. To find the area of a circle -.—Multiply the square of the diameter by .785398, or the square of the circumference by .0711577525. 6. To Hud the diameter ofa...
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Arithmetic on the Productive System: Accompanied by a Key and Cubical Blocks

Roswell Chamberlain Smith - Arithmetic - 1843 - 320 pages
...square inscribed in a circle;—Multiply the diameter by .707016, or the circumference by .225079. 5. To find the area of a circle -.—Multiply the square of the diameter by .785398, or tks tquare of the circumference by .079577525. 6. To find the diameter of a...
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Plane Trigonometry and Mensuration for the Use of the Royal Military College

William Scott - Measurement - 1845 - 288 pages
...s=Ja*,' or, since d=2r, rfazz4r2: whence, by substitution, 1 : 4r2 :: ^ : s, .-. 8=тгг2. Consequently, to find the area of a circle, Multiply the square of the diameter of the circle by .7854: or Multiply the square of the radius of the circle by 3.1416 : the...
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Arithmetic on the Productive System: Accompanied by a Key and ..., Volume 1

Roswell Chamberlain Smith - Arithmetic - 1850 - 314 pages
...square inscribed in a circle '.—Multiply the diameter by .707016, tr the circumference by .225079. 5. To find the area of a circle '.—Multiply the square of the diameter by .785398, or the \quare of the circumference by .079577525. 6. To find the diameter of a...
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The U.S. Law Cabinet

Isaac Ridler Butts - 1852 - 596 pages
...Length, Brea>lth and Depth together, and divide the Product by 1728 to obtain the Cubic Fret. CIRCLES. To find the area of a Circle multiply the square of the Diameter by the Decimal -7854, and the Product will be ihe area [The square of any number is that number...
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A Practical and Theoretical Arithmetic: Designed for the Use of Schools and ...

Charles D. Lawrence - Arithmetic - 1854 - 336 pages
...circumference of a circle. Multiply the diameter by 3.1 416, and the product will be the circumference. RULE V. To find the area of a circle. Multiply the square of the diameter by 0.7854, and the product will be the area. Or, multiply the circumference by half of the...
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