Valentine's Day is a good excuse to explore parametric equations. First students figure the coordinates of this figure using trigonometric unit triangles. Then they simplify and accelerate this task with either a graphing calculator or with online software like Desmos or GraphSketch.com.
The activity: ParametricHeart.pdf
For members we have an editable Word docx, an Excel sheet, and tips/solutions.
ParametricHeart.docx ParametricHeart.xlsx ParametricHeart-solution.pdf
CCSS: HSG.SRT, HSF.TF