This Google Slides Deck prompts students to classify angles into four distinct angle categories: acute, obtuse, right, and straight. By writing one of the classifications on their personal whiteboards, students will develop a deep understanding of angle measurements.I use this activity for RTI with my high school students but it works well for students of many grade levels.WARNING: This activity requires personal whiteboards, erasers, and whiteboard markers. Don't have these available? Check out