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Perimeter

The perimeter is the distance around a given two-dimensional object. It is calculated by adding the lengths of all of the object's sides.

For circles the equation is P= 2 π r, where r is the radius and π is a mathematical constant.

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... of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...