Here are some videos that you might want to watch from the Khan Academy. There are three videos about area and perimeter of different shapes. Pick the ones that would be most beneficial to you.
Area and perimeter of rectangle and triangles:
http://www.khanacademy.org/video/area-and-perimeter?playlist=Geometry
Circles: Radius, Diameter, and Circumference:
http://www.khanacademy.org/video/circles--radius--diameter-and-circumference?playlist=Geometry
Area of Circles:
http://www.khanacademy.org/video/area-of-a-circle?playlist=Geometry
Take a look at one, two, or all three of these to see if they help you understand area and perimeter of shapes better.
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