This Year 3 Right Angles Teaching PowerPoint is the perfect way to demonstrate how to identify right angles in shapes. A good idea prior to the lesson would be to create a physical 'right angle checker' to allow children to come to the board and check the angles themselves. 
This PowerPoint works as a great teaching tool alongside our other resources which children can complete once they understand how to check for right angles in shapes. Take a look at all our great resources for this lesson!