One Special Triangle: Quick Investigation

How would you classify or describe [math]\Delta ABC[/math] by its sides?
Why would you classify this triangle this way? How do you know this to be true?
Use the protractor in the app above to measure the three interior angles of [math]\Delta ABC[/math]. Notice anything? Describe.
Move the LARGE POINTS around again and repeat the same step above. Notice anything? Describe.
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Information: One Special Triangle: Quick Investigation