Consider the cardioid as shown in the figure. Let s() be the arc length from the point
Question:
Consider the cardioid
as shown in the figure. Let s(θ) be the arc length from the point
(2, π) on the cardioid to the point (r, θ), and let p(θ) = 1/K be
the radius of curvature at the point (r, θ). Show that s and p are
related by the equation s² + 9p² = 16. (This equation is called
a natural equation for the curve.)
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