What math is required to do fine art?

Basic Geometry would be helpful

Required? None. It’s art, there are no rules.

Got to agree with @ARE_you_kidding_me

A lot of people think art requires no knowledge. But you do need some knowledge in order to make art. You need a lot of spacial intelligence for drawing, for example.

Everyone can make art. Making great art is a different story.

Approximately zero math is needed, strictly speaking.

The rule of thirds never hurts

But the Rule of Thirds isn’t math.