Dictionary
cardioid
noun car·di·oid \ˈkär-dē-ˌȯid\
Definition of CARDIOID
: 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
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Illustration of CARDIOID
First Known Use of CARDIOID
1753
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