Area of a triangle (Coordinate Geometry)

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Abstract:: An interactive applet and associated web page that calculate the area of a triangle using the formula method in coordinate geometry. The applet has a triangle with draggable vertices. As you drag them the triangle's area is recalculated from the vertex coordinates using the formula. The grid and coordinates can be turned on and off. The area calculation can be turned off to permit class exercises and then turned back on the verify the answers. The applet can be printed as it appears on the screen to make handouts. The web page has a full description of the method for determining area using the formula method, a worked example and has links to other pages relating to coordinate geometry. 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.

Conditions of Use:: Custom Permissions
User may: * Use, view and link to any page on the site. * Print any page and distribute printed copies on a non-commercial basis. User may charge to cover the costs of printing and distribution. * Create courses or other documents that have links to any page in the site, even if that makes it look like the pages are part of the course, so long as the page contents are not modified. User may not: * Copy any file on the site electronically, other than for the purposes stated above.

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Rubric	Average Score (3 Points Possible)
Degree of Alignment	2
Quality of Explanation of the Subject Matter	3 (1 user)
Utility of Materials Designed to Support Teaching	N/A
Quality of Assessments	N/A
Quality of Technological Interactivity	3 (1 user)
Quality of Instructional and Practice Exercises	2 (1 user)
Opportunities for Deeper Learning	N/A

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