There are various websites, applets and tools available to show constructions on an Interactive Whiteboard, but I like this one as the compass actually behaves and sort of looks like the ones students use. Not sure how much longer Flash will still work, so if there are any others similar, that you use, please share in the comments.
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I really like Math Open Reference https://colleenyoung.wordpress.com/2011/01/08/math-open-reference/ – scroll down a bit and you’ll see reference to constructions.
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