Geometry and Mathematics Teachers you can use Valentines Day to teach about CURVES.
One of several ways to make curves in Inkscape is the Spiral Tool.
If your students don't have this or a similar program they can draw curves by hand.
I set the Spiral Tool to make a very open arc then used Duplicate and Flip Object and then a simple RED Fill.
If you do use a software you can talk about how the program parameters relate to algebra and then lead the discussion to equations for CARDIOIDS?
If anyone says ...yes but this is pointless we can download clip art
NO its NOT because you can teach about how Clip Art is Created!
There are a couple of other ways to make heart shapes without a digital pen or tablet and pen in Inkscape. More about that next time.