Here are some useful websites for Angles for your reference.
http://www.tjleone.com/a08_name_angles.htm
http://www.amblesideprimary.com/ambleweb/mentalmaths/protractor.html
http://www.kidport.com/Grade5/Math/MeasureGeo/MeasuringAngles.htm
http://nlvm.usu.edu/en/nav/frames_asid_127_g_2_t_3.html?open+activities
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