by DaleCallahan | Apr 23, 2019 | Geometry, Geometry Chapter 14
Question from Joy: We are in Geometry 3 rd edition. Chapter 14 lesson 2 number 22-23. Page 582. How do you get 108? The answer in key says 3 x 180/5? Why? I think I missed something important yet simple. I was thinking divide 360/5. What an I doing wrong? Thanks!...
by DaleCallahan | Feb 1, 2019 | Geometry, Geometry Chapter 13
For Chap 13, Lesson 6, #32, the basis for the answers is the figure for #6. If we look carefully at the grid, applying the Pythagorean Theorem gives XY^2 = 2^2 + 2^2 = 8, so XY = sqrt8 = 2sqrt2. YZ^2 = 1^2 + 1^2 = 2, so YZ =sqrt2. Therefore XY = 2YZ.Harold Jacobs...
by DaleCallahan | Sep 5, 2018 | Blog, Geometry
The 3rd edition of the Harold Jacobs Geometry textbook has gone through three different printings with 3 different covers and ISBNs. If you are picking a text and looking at used options, it can be confusing. So let me try to help. First, all 3 versions are basically...
by DaleCallahan | Sep 5, 2018 | Geometry, Geometry Chapter 8
Question from Jennifer: Chap 8 review #32 We aren’t sure how the answer would be 24mm. Answer: This is not explained well in the textbook. First – the translation is the movement of the bat from position B to position C (see chap 8, Lesson 2) A translation is...
by DaleCallahan | Jul 19, 2018 | Geometry, Geometry Chapter 5
Question from Courtney I’m having trouble with Chapter 5, Lesson 1, Problem 29. I have worked the problem, I know what the answer should be, but given the figure, I don’t understand how that could be false. Without the figure, I understand it. Answer: You...
