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Sagot :
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.
Answer:
Surface area of sphere = 144 cm².
Step-by-step explanation:
Given : A spherical balloon has a circumference of 21 cm.
To find : What is the approximate surface area of the balloon to the nearest square centimeter,
Solution : We have given that circumference of sphere = 21 cm.
Circumference of sphere = 2 * pi * radius .
Plug the value of circumfrence
2 * pi * radius = 21 cm
2 * 3.14 * radius = 21
radius * 6.28 = 21
On dividing by 6.28 both sides
Radius = [tex]\frac{21}{6.28}[/tex]
Radius = 3.34 cm
Surface area of sphere = 4 * pi * (radius )².
Surface area of sphere = 4 * 3.14 * (3.34 )².
Surface area of sphere = 144.11 cm²
Therefore, Surface area of sphere = 144 cm².
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