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i already know part b is 2826
i just need help with part a

sorry im not good at this ):
@nnesha can u help? :)

i already know part b is 2826
i just need help with part a

its a matter of substituting r = 3t in the formula for the area
A = pi r^2 = pi (3t)^2

now simplify

A = 9 pi t^2

thank you so much :)