- #1

mary d

- Thread starter mary d
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- #1

mary d

- #2

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a=4*pi*(r^2)

suppose that a is the area of the first balloon

Now to calculate tha area of the second balloon (a2) put

a2=4*pi*((r*2.75)^2)

=4*pi*(r^2)*7.56

As you can see, the area of the second balloon is bigger than of the first by a factor of 7.56

The quantity of paint you need to paint a balloon is proportional to the area of the balloon

- #3

HallsofIvy

Science Advisor

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And that is proportional to the square of the diameter.The quantity of paint you need to paint a balloon is proportional to the area of the balloon.

Since the second balloon's diameter is 2.75 times as big, you will need (2.75)

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