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Mrgnw · Answer 1 · 2017-06-29T04:42:51+0000

Answer:140 cm^2

Explanation:

The answer is D. 140 cm². I think the circumference of the balloon means the circumference of the biggest circle. So the 21=2πr². While the surface area of a sphere is S=4πr². So the S≈140 cm².

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