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The perimeter is the measure of length of the boundary of a 2-dimensional object.
The most common mathematical objects in this category are squares, rectangles, circles and triangles.
The perimeter of a square = 4d (where d is the length of 1 side)
The perimeter of a rectangle = 2l + 2w (where l is the length and w is the width)
The perimeter of a circle = 2πr (where π is the mathematical constant pi and r is the radius. The perimeter of a circle is better known as the circumference)
The perimeter of a triangle is the total length of all three sides.
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