: a heart-shaped curve that is traced by a point on the circumference of a circle rolling completely around an equal fixed circle and has an equation in one of the forms ρ = a(1 ± cos θ) or ρ = a(1 ± sin θ) in polar coordinates
- ABP fixed circle
- PCD first position of rolling circle
- P tracing point
- PM diameter through P
- P1 P2 P3 P4 various positions of P
- P1M1 P2M2 P3M3 P4M4 various positions of PM
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Merriam-Webster unabridged
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