AP Calculus BChardmcq1 pt
The path r(t) = ⟨3cos t, 3sin t⟩ is a circle, and its circumference equals
A.6π
B.3π
C.9π
D.2π
Explanation
Core Concept
Speed 3 over 2π gives 6π = 2π(3).
Correct Answer
A6π
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