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CK-12 Trigonometry by [CK-12 Foundation]
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CK-12 Trigonometry Kindle Edition

3.5 out of 5 stars 43 customer reviews
Customers reported quality issues in this eBook. This eBook has: Typos.
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Length: 578 pages Optimized for larger screens
  • Due to its large file size, this book may take longer to download

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Product Details

  • File Size: 15510 KB
  • Print Length: 578 pages
  • Simultaneous Device Usage: Unlimited
  • Publisher: CK-12 Foundation (September 10, 2010)
  • Publication Date: September 10, 2010
  • Sold by: Amazon Digital Services LLC
  • Language: English
  • ASIN: B0042XA32G
  • Text-to-Speech: Enabled
  • X-Ray:
  • Word Wise: Not Enabled
  • Lending: Not Enabled
  • Enhanced Typesetting: Not Enabled
  • Amazon Best Sellers Rank: #12,490 Free in Kindle Store (See Top 100 Free in Kindle Store)
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Customer Reviews

Top Customer Reviews

By Ed Pegg Jr VINE VOICE on October 4, 2010
Format: Kindle Edition Verified Purchase
The ck12.org foundation has made more than a dozen free math and science textbooks available, and this geometry textbook is one of them.

There are full images in this. This book is much larger than what is typically available for free. The images look good, but they are typically roughly two times too large at the moment. Also, all places where TeX is used, a too-large blocky image is used instead. For example, "(3,3)" is presented three times larger than the surrounding text. There are many of these on every page. In this particular ebook, it's inconsistently sized. For example, see location 4561-71.

Not all images seem to have made it. For example, on location 4513-28, three images are listed as "not available". Since this is a digital textbook, I'm sure those will be fixed. The errors above will also probably be addressed quickly.

Despite the above mentioned (and perhaps soon-fixed) flaws, this is worthwhile download.
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By L. James on December 27, 2012
Format: Kindle Edition Verified Purchase
This little free book suffices for someone already well versed in math and confident in themselves to review Trig, but I would Never suggest anyone use it to actually learn the subject. I can forgive the occasional typographical error that slips past a proofreader, but to allow errors such as the area of a rectangle being "2*w*h", and then compound that error by using the formula over and over is a deathknell for any textbook. Not only does it teach how to solve the question wrong but it undermines any confidence in the rest of the book since whenever the student comes up with a different answer they won't know who is wrong: them or the book.
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Format: Kindle Edition Verified Purchase
I realize that it's free, but seriously! The area of a rectangle does not equal 2hw! And there are not 360 seconds in a degree! (A=wh, a second=1/3600 of a degree)That's as far as I've gotten in the book, I'm sure I'll find more as my exploration deepens, but these are INEXCUSEABLE! I haven't taken a math course in 5 years, I've forgotten most of what I learned, which is why I was looking for a cheap refresher, but this is ridiculous. I'm smarter than my math book.
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Format: Kindle Edition Verified Purchase
This review is for the Kindle edition. The text and layout of trigonometry is well presented and methodical. The problem come with presenting it on Kindle. It's hard to put a protractor on the screen (heaven forbid you also try to use a compass). Some presentations just plain belong on paper. Kindle is great for many things, but trig and geometry are not two of them.
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Format: Kindle Edition Verified Purchase
It's been over 20 years since I've had a trigonometry class and I've forgotten a great deal of math over the years, so when I found a free trigonometry book available on the Kindle, I grabbed it and wanted to check it out. Granted, it will probably never have a practical use in my day job, but it never hurts to read and glance over it.

The book layout isn't that great. The Kindle formatting isn't that great either. For example, the Table of Contents is located at the end of the book, so if you start at the beginning of the book, you're a little confused as to the aims for the first chapter.

So why 5 stars? If you're a student, this book is worth downloading. If I was retaking a University math course, I'd download it to have as a second reference source. And it's free.
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Format: Kindle Edition Verified Purchase
I may soon take a graduate level advanced math class so I need to do a quick brush up. I was going to start with calculus but then I saw this free book and decided to start simple. Sort of simple - in high school I skipped trig for calculus and started college in calculus so I never had trig - in some ways this would be new to me.

The book was clear and easy to understand. The style and language reflected the target audience - I quickly got back into the high-school-math-book mode though with a few things have changed in the last xx years since I was in school- up to date references/examples, URLs given in a few spots (high school for me was pre-Internet), many sections on using graphing calculators, etc.

For the most part I have no issues with the content or the way it was presented. I was a little taken aback the first time I came upon a section on using a graphing calculator but I guess you teach the kids what they'll be using. No, it wasn't that: my main problem is with the Kindle implementation.

The problem is that most of the equations are images. OK, most of the images are fine. In fact, pretty good. It's just that it seems they tried to fit multiple lines worth of equations onto 1 line and it often came out unreadable.

The first thing I did was turn my Kindle sideways. This helped but I was still missing quite a bit. I then tried the PC version. Even better yet I was still missing a lot.

In a few places I was missing main parts of the content, in which case I just found it on line. Trig is trig. More often how the concept was derived was unreadable. I could work it out on my own without a problem: I mean this is high school math and not rocket science.
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Format: Kindle Edition Verified Purchase
I will use this both on my Kindle and on my PC with the purchase of CK-12 Trigonometry in a Kindle digital format, you can easily download the Kindle Reader for PCs and make the best of this book. It presents Trigonometry to the reader in a concise way to give the student an easy understanding of the subject. I think the review by Dr. Bogan Tunguz is probably all you need to read concerning this book, other than the fact the Kindle Reader for PC's allows you to read and study this book on your PC and your Kindle Reader. The combination is a winner if you choose the PC Reader App. and download it free from Amazon, then just open this, or any of your Kindle books on your PC.
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