Download at WoweBook.Com Advance Praise for Head First 2D Geometry “Head First did it again The ability to make the reader understand, despite tricky topics, really shines through in Head First 2D Geometry! The way the information is presented and organized makes learning cohesive and easy Coming from someone who has struggled with many aspects of math in the past, this book helps you understand the basics and build on them I wish I had this book when I was taking Geometry!” — Amanda Borcky College student “Head First 2D Geometry is a clearly written guide to learn about two-dimensional shapes The thorough explanations of the material are adequate for both a first-time student and one needing a quick review The ‘hands on’ approach gives a richer understanding of the material than would otherwise be obtained from a traditional textbook.” — Ariana Anderson Statistician at UCLA’s Center for Cognitive Neuroscience “Head First 2D Geometry helps you learn that plane geometry doesn’t have to be plain geometry This book lets you see that geometry is not only in the classroom, it is all around you and a part of your everyday life.” — Herbert Tracey Instructor of mathematical sciences at Loyola University Maryland and former department chair of mathematics at Hereford High School “Head First 2D Geometry is clear and readable, while other textbooks drag students through a thicket of academic jargon Head First has interesting examples, fun design, and a conversational style that the textbook industry would well to emulate.” — Dan Meyer High school math teacher and recipient of Cable in the Classroom’s Leader in Learning award “Head First 2D Geometry grabs your attention with inventive and clever applied problems It pursues thorough solutions with persistence and energy There is one character who appears throughout the book and delights me—a serious, seemingly humorless girl who suspects the authors are trying to get away with inconsistency and poor logic They always praise her questions and give in to her demands that they level with her.” — David Meyer Retired college and high school math teacher Download at WoweBook.Com Praise for other Head First books “Head First Algebra is a clear, easy-to-understand method to learn a subject that many people find intimidating Because of its somewhat irreverent attitude in presenting mathematical topics for beginners, this book inspires students to learn Algebra at a depth they might have otherwise thought unachievable.” — Ariana Anderson Statistician at UCLA’s Center for Cognitive Neuroscience “The way Head First Algebra presents information is so conversational and intriguing it helps in the learning process It truly feels like you’re having a conversation with the author.” — Amanda Borcky College student “Head First Algebra has got to be the best book out there for learning basic algebra It’s genuinely entertaining.” — Dawn Griffiths Author, Head First Statistics “Head First Algebra is an engaging read The book does a fantastic job of explaining concepts and taking the reader step-by-step through solving problems The problems were challenging and applicable to everyday life.” — Shannon Stewart Math teacher “Head First Algebra is driven by excellent examples from the world in which students live No trains leaving from the same station at the same time moving in opposite directions The authors anticipate well the questions that arise in students’ minds and answer them in a timely manner A very readable look at the topics encountered in Algebra 1.” — Herbert Tracey Instructor of mathematical sciences, Loyola University Maryland “If you want to learn some physics, but you think it’s too difficult, buy Head First Physics! It will probably help, and if it doesn’t, you can always use it as a doorstop or hamster bedding or something I wish I had a copy of this book when I was teaching physics.” — John Allister Physics teacher Download at WoweBook.Com Praise for other Head First books “Head First Physics has achieved the impossible—a serious textbook that makes physics fun Students all over will be thinking like a physicist!” — Georgia Gale Grant Freelance science writer, communicator, and broadcaster “Great graphics, clear explanations, and some crazy real-world problems to solve! Head First Physics is full of strategies and tips to attack problems It encourages a team approach that’s so essential in today’s work world.” — Diane Jaquith High school physics, chemistry, and physical science teacher “Head First Physics is an outstandingly good teacher masquerading as a physics book! You never feel fazed if you don’t quite understand something the first time because you know it will be explained again in a different way and then repeated and reinforced.” — Marion Long Teacher “Dawn Griffiths has split some very complicated concepts into much smaller, less frightening bits of stuff that real-life people will find very easy to digest Head First Statistics has lots of graphics and photos that make the material very approachable, and I have developed quite a crush on the attractive lady model who is asking about gumballs on page 458.” — Bruce Frey Author, Statistics Hacks “Head First Statistics is an intuitive way to understand statistics using simple, real-life examples that make learning fun and natural.” — Michael Prerau Computational neuroscientist and statistics instructor, Boston University “Thought Head First was just for computer nerds? Try the brain-friendly way with Head First Statistics and you’ll change your mind It really works.” — Andy Parker “Down with dull statistics books! Even my cat liked Head First Statistics.” — Cary Collett Download at WoweBook.Com the index perimeter of (see perimeter) scaling (see scaling shapes) similar (see similar shapes) (see also specific shapes) shooting example (see homicide example) similar shapes, 58–63, 67, 77, 89, 100 proportional scaling of, 73–76 ratios for, 92–98 right triangles and, 120–122 (see also scaling shapes) 6-sided shapes (see hexagons) skate ramp example, 104–147 multiple ramps, 132–135 perpendicular uprights, 106–131 rope swing, 139–147 sketches (see drawings) speakers example, 170–180 spread angle of speakers, 170–172, 174 squares, 268 area of, 286 perimeter of, 286–287 similarity of, 77, 100 (see also quadrilaterals; regular polygons) straight lines (see lines) Super Triangles (Pythagorean triples), 146, 148 supplementary angles, 17–18, 47 T trapezoids, 262, 267, 269, 272 area of, 260–265 bases of, 262 compared to parallelograms, 270 isosceles trapezoids, 267, 269 triangles altitude line for, 144–145, 148 angles of, adding, 20–22, 46 angles of, estimating, 175–180 area of, 162–167, 202, 290–294 bisecting, 144–146 bounding rectangle for, 157–163 centers of, 181–188 equilateral triangles, 176, 188, 290–294, 318 hypotenuse of, 131, 138 isosceles triangles, 144–145, 175–180, 269 legs of, 131, 138, 141 medians of, 182, 202 perimeter of, 294 right triangles (see right triangles) scalene triangles, 194–198 similar triangles, 58–63, 67, 73–76 V vertical angles, 19, 40, 47 volume of 3D shapes, 278–280 Z Z patterns, in parallel lines, 40, 47 3-sided shapes (see triangles) 3D shapes, volume of, 278–280 trapeziums, 270 you are here 4 325 Download at WoweBook.Com Download at WoweBook.Com