Which Parametric Equations Describe a Circle with Its Center at the Origin

question 37

Multiple Choice

Which parametric equations describe a circle with its center at the origin and a radius of 7 for $0 \leq t \leq 2 \pi ?$

• A) x=7 cos t and y=7 sin t
• B) x=7 sin t and y=7 sin t
• C) x=cos 7 t and y=sin 7 t
• D) \(x=\frac{1}{7} \cos t \text { and } y=\frac{1}{7} \sin t\)
• E) x=49 cos t and y=49 sin t

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