Useful diagrams. Click to open the Word file: 3d-diagrams
Category Archive: geometry
Oct 06
Archimedes’ Puzzle
http://illuminations.nctm.org/Lesson.aspx?id=2523 “The Stomachion is an ancient tangram-type puzzle. Believed by some to have been created by Archimedes, it consists of 14 pieces cut from a square. The pieces can be rearranged to form other interesting shapes. In this lesson, students learn about the history of the Stomachion, use the pieces to create other figures, learn about …
Apr 27
Conic Sections on Desmos
Go to this Desmos graph https://www.desmos.com/calculator/tsfynm2to8 It shows two each of the four conic sections Circles, Ellipses, Hyperbolas, Parabolas Note: A hyperbola has two branches. Only one is shown in the image. A cone actually has two frustums. The image only shows one frustum. http://www.intmath.com/plane-analytic-geometry/conic-sections-summary-interactive.php
Apr 20
Why the Area of a Trapezoid is What it is
There are six ways to show that the area of a trapezoid is See the following PowerPoint file:TrapezoidArea6Ways
Mar 23
Spotting Numbers and Visual Patterns
Here a two great websites that provide lots of great pattern problems. [this website hasn’t been functional lately – too bad! – Spotting Numbers – interactive, does require Java.] Visual Patterns – less interactive, (no Java needed). These patterns can be used with elementary students (if you just ask number questions) through advanced algebra (if …
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