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R(t)=3t A(r)=pi r^2 find A[r(t)]
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3 votes
R(t)=3t
A(r)=pi r^2
find A[r(t)]

User FiberOptics
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1 Answer

3 votes
r(t) = 3t; a(r) = πr²

subtitute:

a[r(t)] = π(3t)² = 9πt²
User Andrew Paes
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