Circumscribed rectangle, bounding box. (Coordinate Geometry)

An interactive applet and associated web page that show the definition and properties of the bounding box of a polygon or set of points. The bounding box is used in other entries to find area using the so-called box method. The grid, coordinates and calculations can be turned on and off for class problem solving. The applet can be printed in the state it appears on the screen to make handouts. The web page has a full definition of a bounding box when the coordinates of the points defining it are

Print blank graph paper

A page that allows you to print rectangular (cartesian) graph paper. You ca control if grid lines are printed and the position of the origin. By dargging the origin into any corner a single quadrant can be printed. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Constructing the Incenter of a triangle

An interactive applet and associated web page that provide step-by-step animated instructions on how to construct the incenter of a triangle. The animation can be run either continuously like a video, or single stepped to allow classroom discussion and thought between steps. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Finding the foci an ellipse

An interactive applet and associated web page that provide step-by-step instructions on how to find the foci of a given ellipse using a compass. The animation can be run either continuously like a video, or single stepped to allow classroom discussion and thought between steps. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Constructing circumcenter of a triangle with compass and straightedge

An interactive applet and associated web page that provide step-by-step animated instructions on how to construct the circumcenter of a triangle. The animation can be run either continuously like a video, or single stepped to allow classroom discussion and thought between steps. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Constructing a 90 degree angle with compass and straightedge

An interactive applet and associated web page that show how to construct a 90 degrees right angle with a compass and straightedge. The animation can be single-stepped or run as a continuous movie. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

SSA doesn't work

An interactive applet and associated web page that shows that side-side-angle is not enough to prove congruence, because two triangles can meet the condition. The applet shows two triangles, one of which can flip between the two possible configurations that both meet the SSA criteria, showing it is insufficient. The web page describes all this and has links to other related pages. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the M

Congruent Polygons

An interactive applet and associated web page that demonstrate the congruence of polygons. The applet presents nine polygons that are in fact congruent, but don't look it because they are reflected and rotated in various ways. If you click on one, it rotates and flips as needed, then slides over the top of another to show it is congruent. The web page describes how to determine if two polygons are congruent. Applet can be enlarged to full screen size for use with a classroom projector. This reso

AAA Doesn't work

An interactive applet and associated web page that shows that angle-angle-angle (AAA) is not enough to prove congruence. The applet shows two triangles, one of which can be dragged to resize it, showing that although they have the same angles they are not the same size and thus not congruent. The web page describes all this and has links to other related pages. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference I

Radius of an Arc or Segment

An interactive applet and associated web page that describe the radius of an arc and how to derive it from the width and height of the segment defined by that arc. A practical use is described for finding the radius of a circular arch given its other dimensions. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Perimeter of a triangle

A web page and interactive applet show how to compute the perimeter of a triangle. A triangle is shown that can be resized by dragging its vertices. As you drag, the perimeter is continuously recalculated. Text on the page explains that the perimeter is the sum of the sides. For those who prefer it, in a formula that is given. Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference interactive geometry reference book

Working in Paterson: Occupational Heritage in an Urban Setting

Working in Paterson: Occupational Heritage in an Urban Setting presents 470 interview excerpts and 3882 photographs from the Working in Paterson Folklife Project of the American Folklife Center at the Library of Congress. The four-month study of occupational culture in Paterson, New Jersey, was conducted in 1994. Paterson is considered to be the cradle of the Industrial Revolution in America. It was founded in 1791 by the Society for Establishing Useful Manufactures (S.U.M.), a group that had U.

Reel American History Project

The general goal of the Reel American History project is to foster critical thinking about a matter of enduring cultural attention, especially where young people are concerned: the formation of our national identity.
Reel American History is designed to be a "Collaborative Shared Resource". It aims at being a large, ongoing, cumulative, collaborative project that involves many students and many faculty over a long period of time. We strive to engage students in authentic learning â€“ making st

Vertebrates are Cool!

As an introductory activity, students will read the eBook Vertebrates and then keep it as reference source. They will discuss the different animal species found in vertebrates. As a project, students will pick a vertebrate and create an eBook with one photo about that vertebrate. They will research the vertebrate both in the media center and on Web pages downloaded with FlingIt. Students will give an oral report of the special characteristics of their vertebrate and then beam their eBooks to oth

Hermann Hesse's Siddhartha

Almost all major works in philosophy and literature are accessible via online sources on the Internet. Fortunately, much of the best work in philosophy and literature is available in the public domain. A translation of Herman Hesse's Siddhartha, in particular, became available through Project Gutenberg by Michael Pullen. This edited version of that text is subject to the legal notice following the title page referencing the GFDL License. By placing this edited reading selection under the GFDL, t

Lenz's Law Demonstration Device - The Ring Fling Machine

The instructions provided here are of devices that have been built for Jefferson Lab's Science Education program. The difficulty of construction varies from project to project. Anyone attempting to construct these devices needs to know and understand how to safely operate the tools required to construct them. If you do not know how to properly operate power tools or a soldering iron, you should not attempt to build any of these devices.

Go Far Car Ramps

Developed for use with Jefferson Lab's Go Far Cars experiment, this simple ramp can easily be set to four different height settings. The ramp settings are uniformly spaced, so the amount of gravitational potential energy given to an object at the top of the ramp increases by a constant amount as the ramp is placed at higher settings. The instructions provided here are of devices that have been built for Jefferson Lab's Science Education program. The difficulty of construction varies from project

Electromagnet Experiment Stand - A Variable Power Electromagnet

The instructions provided here are of devices that have been built for Jefferson Lab's Science Education program. The difficulty of construction varies from project to project. Anyone attempting to construct these devices needs to know and understand how to safely operate the tools required to construct them. If you do not know how to properly operate power tools or a soldering iron, you should not attempt to build any of these devices.

Invisible Electromagnet â€“ A Transparent Magnetic Field Viewer

The instructions provided here are of devices that have been built for Jefferson Lab's Science Education program. The difficulty of construction varies from project to project. Anyone attempting to construct these devices needs to know and understand how to safely operate the tools required to construct them. If you do not know how to properly operate power tools or a soldering iron, you should not attempt to build any of these devices.

Cloud: Wild Stallion of the Rockies

Filmed in the mountains of Montana, this poignant, engrossing chronicle focuses on an extraordinary stallion, whose life has been recorded since his birth in the wild in 1995 by Emmy-winning filmmaker Ginger Kathrens. (50:52)