Answer: C. 24 units
Explanation:
The circumference of a circle is 2πr. Let's say x = 1/3r. Thus, the area of circle A relative to circle B is 1:3. Thus, circle B is 3 times larger than circle A. So, simply divide 64π by 4 to get 16π. Then multiply 16π*3=48π. For the circumference of a circle to be 48, the radius would have to be 24.
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Answer:
The answer is C, 24 units.
Let be the radius is circle A and be the radius of circle B.
Radius of circle A is 1/3 of the radius of circle B, or:
The sum of their circumferences is . In other words:
Substitute :
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