Elipses
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$\vec{r}_1(t) = \langle 2\cos t, 2\sin t \rangle$
$\vec{r}_2(t) = \langle 4+2\cos t, 4+2\sin t \rangle$
$\vec{r}_1(t) = \langle \cos t, 3\sin t \rangle$
$\vec{r}_2(t) = \langle 4+\cos t, 4+3\sin t \rangle$
Circunferencia
Elipse