# Definition:Trifolium

## Trifolium

The trifolium is the instance of the rhodonea curve for $n = 3$:

### Cosine Form

The trifolium can be defined by the polar equation in the form:

$r = a \cos 3 \theta$

where:

$0 \le \theta \le \pi$

### Sine Form

The trifolium can be defined by the polar equation in the form:

$r = a \sin 3 \theta$

where:

$0 \le \theta \le \pi$

## Also known as

The trifolium is also seen referred to as a three-leaved rose, or three-petalled rose.