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Books Books 11 - 13 of 13 on In this method the right angle is divided into 90 equal parts, each of which is called....  
" In this method the right angle is divided into 90 equal parts, each of which is called a degree. Each degree is subdivided into 60 equal parts, each of which is called a minute. "
Trigonometry and Double Algebra - Page 3
by Augustus De Morgan - 1849 - 167 pages
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Trigonometry for Beginners

John Bascombe Lock - Logarithms - 1896 - 147 pages
...to draw. (iii.) It is an angle whose size is very familiar. 13. The right angle is divided into 90 equal parts, each of which is called a degree ; each degree is subdivided into 60 equal parts, each of which is called a minute ; and each minute is again subdivided...
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A Source Book in Geography

George Kish - Science - 1978 - 453 pages
...whence it is clear that in the entire zodiac there are 360 degrees. Also, according to astronomers, each degree is divided into 60 minutes, each minute into 60 seconds, each second into 60 thirds, and so on. And as the zodiac is divided by astronomers, so each circle...
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The Book of Numbers

John Horton Conway, Richard Guy - Mathematics - 1996 - 310 pages
...seems that the Babylonians divided a complete circle into 360 degrees (). In the Babylonian manner, each degree is divided into 60 minutes ('), each minute into 60 seconds ("), each second into 60 thirds ('"), and so on. Again, it is because mathematical and astronomical...
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