Solve the problem.Find the area A and circumference C of a circle of radius 9 cm. Express the answer in terms of ?.

A. A = 324? cm2; C = 9? cm 
B. A = 18? cm2; C = 18? cm 
C. A = 36? cm2; C = 9? cm
D. A = 81? cm2; C = 18? cm

Answer: D

Mathematics

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