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19.07.2019 •
Mathematics
Aballoon has a circumference of 28 in. use the circumference to approximate the volume of the balloon to the nearest square inch. answer choices: 3,659 in ^3 11,488 in ^3 2,964 in ^3 944 in ^3
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Ответ:
a) A balloon has a circumference of 28 in. Use the circumference to approximate the volume of the balloon to the nearest cubic inch.
or
b) A balloon has a circumference of 28 in. Use the circumference to approximate the surface area of the balloon to the nearest square inch.
case a)
we know that
circumference=2*pi*r
clear variable r
r=circumference/(2*pi)
circumference=28 in
r=28/(2*pi)> r=4.46 in
volume of a balloon=(4/3)*pi*r³> (4/3)*pi*4.46³> 371.61 in³
Volume=372 in³
the answer is
372 in³
case b)
we know that
circumference=2*pi*r
clear variable r
r=circumference/(2*pi)
circumference=28 in
r=28/(2*pi)> r=4.46 in
surface area of a balloon=4*pi*r²> 4*pi*4.46²---> 249.83 in²
Surface area=249.83 in²> 250 in²
the answer is
250 in²
Ответ:
The answer in the picture
Step-by-step explanation: