David Walker
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David's posts
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Still Not My Father's Math Class
This is what Theoni Pappas writes on page 169 of her  Magic of Mathematics  -- a short timeline: 600 BC -- EUCLIDEAN GEOMETRY 1637 -- Analytic Geometry NON-EUCLIDEAN GEOMETRIES 1639 -- Projective Geometry 1736 -- Topology 1829 -- Hyperbolic Geometry 1854 --...﻿
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Van Brummelen Chapter 2: Exploring the Sphere
Table of Contents: 1. Pappas Page of the Day 2. Van Brummelen Chapter 2: Exploring the Sphere 3. Exercise 2.7: What Color Is the Bear? 4. Exercise 2.12: Spherical Polygon-Sum Theorem 5. Exercise 2.14: Polar Triangle Inequality 6. A Possible High School Geom...﻿
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Van Brummelen Chapter 1: Heavenly Mathematics
Table of Contents 1. Pappas Page of the Day 2. Introduction to Van Brummelen's Book 3. Chapter 1: Heavenly Mathematics 4. Exercise 1.1: sin 3 5. Exercise 1.2: Subtraction Formula for Sine 6. Exercise 1.3: Concavity of Sine 7. Exercise 1.11: Velocity Due to ...﻿
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Misconceptions
Table of Contents 1. Pappas Page of the Day 2. The Best Laid Plans 3. Revisiting My "Rules" 4. Why? Because I said so! 5. Teacher Tone 6. Teacher Look 7. Traditionalists 8. Valedictorians 9. Participation Points 10. Plans for a Future Post Pappas Page of th...﻿
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More Reflections on the Past Year
Table of Contents 1. Pappas Page of the Day 2. The First Summer Post? 3. A Few Things About My New School 4. Problems Adapting to Change 5. Classroom Management 6. Neutering the No Talking Rule 7. Neutering the Discipline Hierarchy 8. Traditionalists Pappas...﻿
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A Major Announcement
This is what Theoni Pappas writes on page 151 of her  Magic of Mathematics : "The ancient Greeks knew how to construct the lengths of irrational numbers using the Pythagorean Theorem." I've decided to make my grand return to the MTBoS today. Today, I'm actu...﻿
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SBAC Practice Test Questions 5-6 (Day 164)
This is what Theoni Pappas writes on page 150 of her  Magic of Mathematics : "Namely, the diagonal numbers 42; 25, 35 convert to 42 + (25/60) + (35/3600) = 42.42638889 while 30sqrt(2) = 42.42640687." Oops -- well, we're on the last page of the first section...﻿
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SBAC Practice Test Questions 3-4 (Day 163)
This is what Theoni Pappas writes on page 146 of her  Magic of Mathematics : "Only a few of the many thousands of mathematicians and ideas are mentioned in this chapter. Those I discuss in no way reflect their superiority or stature over those not appearing...﻿
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SBAC
This is what Theoni Pappas writes on page 145 of her  Magic of Mathematics : "History shows that mathematical creativity is not privy to any particular culture, time period, civilization, or gender. The wealth of amazing ideas and contributions that were de...﻿
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Chapter 15 Test (Day 161)
This is what Theoni Pappas writes on page 144 of her  Magic of Mathematics : "In most sciences one generation tears down what another has built and what one has established another undoes. In mathematics alone each generation adds a new story to the old str...﻿