Question 1203678
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{{{r(t) = 4t}}}<br>
{{{A(r) = (pi)(r^2)}}}
{{{A(t) = (pi)(r(t))^2 = (pi)((4t)^2) = 16(pi)t^2}}}<br>
ANSWER: {{{A(t)=16(pi)t^2}}}<br>