Question

What's the radius of a circle with area 9π units2? A) 81 units B) 9 units C) 3 units D) 18 units

Answer 1

C. 3 units

Step-by-step explanation:

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Answer 2

C) 3 units

Step-by-step explanation:

The area is given by the formula ...

A = πr²

Fill in the given value for area and solve for r:

9π = πr²

9 = r² . . . . . . . . divide by pi

√9 = r = 3 . . . . take the square root

The radius is 3 units.