You can learn about 2D shapes using this Powerpoint : 2D Shapes
And strengthen your skills by practising this online game http://www.innovationslearning.co.uk/subjects/maths/information/shape_facts/shape_facts.htm
And strengthen your skills by practising this online game http://www.innovationslearning.co.uk/subjects/maths/information/shape_facts/shape_facts.htm