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Alexandra [31]
3 years ago
8

A balloon has a circumference of 23 cm. Use the circumference to approximate the surface area of the balloon to the nearest squa

re centimeter.
Mathematics
1 answer:
AveGali [126]3 years ago
5 0
To get the surface area of a sphere, we need to have the radius. We are given the circumference. The circumference formula is C=2πr.  We need to solve for r. 
23 = 2πr
r=3.66

The calculation for surface area is <span>A = 4πr^2. 
</span>A = 4<span>π(3.66)^2

Solve for A.

A= 168 cm^2.</span>
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