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Tool: 30 - 60 - 90 Triangles - Math Open Reference
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An interactive applet and associated web page that demonstrate the properties of a 30-60-90 triangle. The applet shows a right triangle that can be resized by dragging any vertex. As it is dragged, the remaining vertices change so that the triangle's angles remain 30°, 60° and 90°

The text on the page points out that the sides of a 30-60-90 triangle are always in the ratio of 1 : 2 : root 3

Applet can be enlarged to full screen size for use with a classroom projector. After use in the classroom, student can access it again from any web browser at home or in the library with no login required.

This resource is a component of the Math Open Reference Interactive Geometry textbook project at

Technology Type: Java Applet 
Author: John Page
Language: English 
Cost: Does not require payment for use

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Courses: Geometry Right, Right Triangles, Special right triangle, Pythagorean theorem