Question

What is a quadrifolium?

Answer 1

A quadrifolium is a rose curve with n=2, and a polar equation of
`r = a sin (2theta)`

For `a = 1`, the graph looks like this:

An interesting fact about a quadrifolium is that if you were to draw a circle around the rose curve, the area inside the rose curve would be exactly half the area of the entire circle, `1/2 pi a^2`