A large railroad trust that Roosevelt tackled was the a. Northern Securities Company. b. Standard Oil Company. c. Niagara Movement. d. Crédit Mobilier.

254.34

step-by-step explanation:

the formula for area of a circle is given by

a = pi * r^2

a = pi * 9^2

a = 81*pi

using 3.14 as an approximation for pi

a = 3.14*81

a = 254.34

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