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The video tutorial explains the concept of perimeter, focusing on rectangles. It begins with a general introduction to perimeter as the sum of the lengths of a polygon's sides. The tutorial then presents the specific formula for calculating the perimeter of a rectangle, which involves multiplying the sum of the length and width by two. An example is provided using a rectangle with sides of 8 cm and 3 cm, resulting in a perimeter of 22 cm. The video concludes with a summary of the calculation process.

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