This SMARTboard lesson provides the perfect practice in recognizing angles as either acute, obtuse, or right AND measuring them using a protractor. The lesson has a protractor on each slide and the angle is already in place on the protractor. Students need to read the measurement and determine whether the angle is acute, obtuse, or a right angle. All slides are self checking with a click of the mouse. This works well as an introduction to the concept, as practice, or as a review. It can also easily be used in a teacher directed lesson lending itself to discussion or as an independent activity. Created with Smart Notebook 11. Great for grades 4-7.