An angle is: the space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet.
http://www.visnos.com/demos/basic-angles
http://www.bbc.co.uk/schools/teachers/ks2_activities/maths/activities/angles.swf
http://www.oswego.org/ocsd-web/games/bananahunt/bhunt.html
http://nrich.maths.org/2812
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