30-60-90 triangles have properties that allow you to use shortcuts in order to find leg lengths and the hypotenuse. For example, if you know the hypotenuse you can use these shortcuts to find leg length.
You can also use this 30-60-90 interactive triangle in order to see that as the size of the triangle changes the hypotenuse always equals two times the short side, and the long side equals the short side times square root three.
30 60 90 Triangles
30 60 90 triangles explained with a video and cool applet. The
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