Mary Jane Sterling
Algebra I for Dummies
26 editions
—
published
2001
—
|
|
|
Trigonometry For Dummies
17 editions
—
published
2005
—
|
|
|
Algebra II For Dummies
29 editions
—
published
2004
—
|
|
|
Linear Algebra For Dummies
11 editions
—
published
2006
—
|
|
|
Algebra I Workbook For Dummies
15 editions
—
published
2011
—
|
|
|
Algebra II for Dummies
16 editions
—
published
2014
—
|
|
|
Trigonometry Workbook For Dummies
7 editions
—
published
2005
—
|
|
|
Algebra Workbook for Dummies
6 editions
—
published
2005
—
|
|
|
Algebra II Essentials For Dummies
16 editions
—
published
2010
—
|
|
|
Algebra I: 1,001 Practice Problems For Dummies
10 editions
—
published
2013
—
|
|
“The ancient Greek mathematician Ptolemy was born some time at the end of the first century. Ptolemy based his version of trigonometry on the relationships between the chords of circles and the corresponding central angles of those chords. Ptolemy came up with a theorem involving four-sided figures that you can construct with the chords. In the meantime, mathematicians in India decided to use the measure of half a chord and half the angle to try to figure out these relationships. Drawing a radius from the center of a circle through the middle of a chord (halving it) forms a right angle, which is important in the definitions of the trig functions. These half-measures were the beginning of the sine function in trigonometry. In fact, the word sine actually comes from the Hindu name jiva.”
― Trigonometry For Dummies
― Trigonometry For Dummies
Topics Mentioning This Author
topics | posts | views | last activity | |
---|---|---|---|---|
2024 Reading Chal...: Grace's 125 in 2016 | 144 | 202 | Dec 31, 2016 12:58PM |
Is this you? Let us know. If not, help out and invite Mary to Goodreads.