Solve the problem.The area of a circle is found by the equation A = ?r2. If the area A of a certain circle is 81? square centimeters, find its radius r.
A. 9 cm
B. 9? cm
C. {9 cm, -9 cm}
D. 9
cm
Answer: A
Mathematics
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A. Domain (-?, ?) ; Range [-2, 4] B. Domain (-5, 5) ; Range [-2, 8) C. Domain (-?, ?) ; Range [-2, ?) D. Domain (-?, ?) ; Range [0, ?)
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