I drew a Cardio-id

Kia Ora whanau,
This fortnight for math art we had to draw a Cardioid.
To help us draw this weird but cool shape we were given a grid like template,
It was basically a circle with numbers 1-60 around it.
At the bottom of this template was a table with numbers 1-60 at the top and underneath was blank.
We had to fill in the blank half with numbers, specifically counting in two's, for example 2, 4, 6, 8.
Then we had to draw fine lines following that pattern that we made.

Here's a pic of the Cardioid.

And here's a pic of a Nephroid that I drew afterwards, but instead of counting in 2's, I counted in 3's.