# First lessons in geometry

## byThomas Hill

### Paperback | May 8, 2012

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1878 Excerpt: ... Greek letter is used to expreis the exact proportion of a circumference to a diameter? If there are pupils in the class who have studied arithmetic, 'si them answer such questions as the following, using twentytwo sevenths in the head, or 3.1416 on the slate. The simplest sevenths. And, in almost every question about circles that you will want to answer, this is exactenough. It is nearly enough exact for workmen to work by in making tinned ware, or anything in which the diameter is less than large wash-tubs. 7. So, if you know what the diameter of a circle is, and want to find out how long the circumference is, you must multiply the diameter by twenty-two, and divide the product by seven. If you know what the circumference is, and want to find out what the diameter is, you must multiply the circumference by seven, and divide the product by twenty-two. 8. But, perhaps, you will at some time wish to be more exact, and then it will be better to use a decimal fraction. Perhaps you have not learned decimals yet; but, after you have learned them, you may want to use a better value of Tt, and you can then turn back to this page, and find that n ia very nearly equal to 31416. and beet way of reading decimal fractions is simply to s&j "decimal one four one six." What is the diameter of a hoop 44 inches in circumference i What is the circumference of a hoop 21 inches in duunettt i Ut S-6? 10-5? 17-5? 11? CHAPTER XXV. HOW TO MEASURE THE SIZE OF A CIRCLE. 1. I Have told you that men measure surfaces by squares. They find out, if they can, how many squares it would take to cover the surfaces, if the Bide of each square was just one inch, or one foot, or one yard. I have told you, also, that we can easily find out how many such squares it takes to cover a ...

### Details & Specs

Title:First lessons in geometryFormat:PaperbackDimensions:30 pages, 9.69 × 7.44 × 0.06 inPublished:May 8, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217476813

ISBN - 13:9780217476812

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