Learner's often find it difficult to estimate obtuse and acute angles. This interactive website http://www.crickweb.co.uk/assets/resources/flash.php?&file=angle gives the learners the opportunity to guess angles. You can decide on the type of angle you want the computer to display. The learners then estimate the angle. With a simple click of a button, the protractor is displayed so that the learner can see how accurate they were.
http://www.analyzemath.com/Geometry/angles.html is another site that you might find useful. This site has the definitions and properties of angles in geometry.
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