Quadrifolium

Rose curve with angular frequency 2 From Wikipedia, the free encyclopedia

Quadrifolium

The quadrifolium (also known as four-leaved clover[1]) is a type of rose curve with an angular frequency of 2. It has the polar equation:

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Rotated quadrifolium
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Quadrifolium created with gears

with corresponding algebraic equation

Rotated counter-clockwise by 45°, this becomes

with corresponding algebraic equation

In either form, it is a plane algebraic curve of genus zero.

The dual curve to the quadrifolium is

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Dual quadrifolium

The area inside the quadrifolium is , which is exactly half of the area of the circumcircle of the quadrifolium. The perimeter of the quadrifolium is

where is the complete elliptic integral of the second kind with modulus , is the arithmetic–geometric mean and denotes the derivative with respect to the second variable.[2]

Notes

References

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