Géométrie 3D

We live in a three-dimensional world. Every object you can see or touch has three dimensions that can be measured: length, width, and height. The room you are sitting in can be described by these three dimensions. The monitor you're looking at has these three dimensions. Even you can be described by these three dimensions. In the world around us, there are many three-dimensional geometric shapes.

Développement du cylindre Hilbert and Cohn-Vossen wrote about the cylinder: "The circular cylinder is the simplest curved surface. It can be obtained from the simplest curves -the straight line and the circle- by moving a straight line around the circunference of a circle while keeping it perpendicular to the plane of the circle. Another way to get the cylinder is by rotating a straight line about an axis parallel to it. Thus the circular cylinder is a surface of revolution. The surfaces of revolution are an important class of surfaces, characterized by the property that they can be generated by rotating a plane curve about an axis lying in the plane of the curve." In this page, the cylinder will be closed by two parallel planes perpendicular to the axis. The main interest of this page is to see how a cylinder can be developed into a plane. The lateral surface area of a cylinder is the area of a rectangle. Do you remember how to calculate the volume of a cylinder?

HippoCampus - Homework and Study Help - Free help with your algebra, biology, environmental science, American government, US history, physics and religion homework Plan a Pi Day Party for March 14 Teachers in many classrooms celebrate Pi Day this month. Pi -- the number 3.14… gets its own special day on 3/14, or March 14. EdWorld editors have gathered a collection of links to ideas and activities that will help you plan a Pi Day celebration for your classroom or school. If one day of the year screams "Party!" in math class, that day is March 14. March 14 also happens to be the birth date of Albert Einstein -- which makes the day an extra special one for planning math challenges and math fun! According to Dr. Because pi is 3.14159…, some schools hold their big Pi Day celebrations 3/14 at exactly 1:59 p.m. Education World editors took some time to surf the Internet in search of ideas around which teachers might build Pi Day celebrations. Lesson Plans and Other Activities for Pi Day We have gathered more than two dozen links to Pi Day activity ideas. March 14 Is Pi Day! Great Pi Day Activities for Teachers How to Celebrate Pi Day Pi Day WebQuest Making a Pi Necklace (Grades 5-8) Ask Dr.

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Algebra Menu Algebra is great fun - you get to solve puzzles! With computer games you play by running, jumping or finding secret things. Well, with Algebra you play with letters, numbers and symbols, and you also get to find secret things! The Basics Exponents Simplifying Factoring Factoring - Introduction Logarithms Polynomials Linear Equations Quadratic Equations Solving Word Questions Functions Definition of a Function Sequences and Series Where to Next? Learn trigonometry at our Trigonometry Index Learn about Vectors Learn more advanced algebra at Algebra 2 (College Algebra)