- #1

mary d

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

And that is proportional to the square of the diameter.

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

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