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eli123

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eli123

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@hannah041 help please

petewe

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what's the area of a square?

eli123

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base times height

petewe

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so if base is x, what's area?

eli123

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x^2

eli123

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@petewe

petewe

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and the area of a circle is what?

eli123

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pi times r^2

petewe

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given circumference 12-4x, find r

eli123

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3^2=9

petewe

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where did that come from?

eli123

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12-4x=0

petewe

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let me just show you the whole solution

petewe

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Area of sq = x^2
Area of circle = pi r^2
Circumference of circle = 2 pi r
Therefore,
2 pi r = 12-4x
r = (12-4x)/2pi
area of circle = pi [(12-4x)/2pi]^2
Therefore,
A(x) = x^2 + pi [(12-4x) / 2pi]^2

petewe

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ask where you get lost

eli123

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ok and what would the answer give you?

petewe

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that is the answer