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CT2a Discovering 'angle in a semicircle'

Author:
Tim Devereux
Second circle theorem: Try moving the point P about. Where does P have to be for angle α to be acute? and where must P be for angle α to be obtuse? So where must P be to make angle α  =  90 degrees?
(Now go on to CT2b - the other Geogebra worksheet for the second circle theorem)

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