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Komok [63]
3 years ago
11

A spherical balloon has a circumference of 23 cm. What is the approximate surface area of the balloon to the nearest square cent

imeter? (1 point)
674 cm2
415 cm2
168 cm2
1,662 cm2
Mathematics
1 answer:
Bad White [126]3 years ago
7 0
168cm2
Let r cm be the radius of the balloon, then 
<span>2pi(r)=23=>r=23/(2pi) </span>
<span>The surface area= </span>
<span>4pi(r^2)= </span>
<span>4pi[23/2pi)]^2= </span>
<span>(23^2)/pi=168.386 cm^2 </span>
<span>approximately.</span>
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