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OpenStudy (anonymous):
A ballon has circumference of 16cm. Use the circumference to approximate the surface area of the balloon!
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jimthompson5910 (jim_thompson5910):
What is the radius of this balloon?
jimthompson5910 (jim_thompson5910):
Any ideas?
jimthompson5910 (jim_thompson5910):
Hint: C = 2pi*r C = circumference pi = 3.14 (approximately) r = radius
OpenStudy (anonymous):
it doesn't tell me radius? only circumference.
OpenStudy (anonymous):
I have no idea where to start?
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jimthompson5910 (jim_thompson5910):
You use the circumference formula to find the radius
jimthompson5910 (jim_thompson5910):
C = 2pi*r 16 = 2pi*r ... plug in C = 16 (the given circumference) now solve for r
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