Want to figure out the area and perimeter of irregular shapes? Break them down into regular shapes. For example, a flower can be broken down into semicircles and a square. Don't try to do it the long way—the flower may wilt before you're done.

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Perimeter of Irregular Shapes 
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Perimeter and Circumference 
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Perimeter of a Rectangle 
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Surface Area of Cylinders 
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Surface Area of a Cube 
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Introduction to 3D Geometry 
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Volumes of Prisms and Cylinders 
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Volumen de un Cubo