a bakery charges .10 for a cookie that is 2 inches in diameter. if the price is proportional to the area how much do they charge for an extra large cookie that is 8 inches in diameter? Assume that each cookie is shaped of a circle
a..40
b.80
c. 1.60
d. 6.40
if you answer it you get a medal

Question

anonymous · Answer

Start by finding the area of the two cookies. The area of a circle is equal to pi times the square of the radius:
$$A=\pi r^2$$So what do you get for each of the areas? Remember that the radius is one half of the diameter.

anonymous · Answer

idk @vinnv226

tkhunny · Answer

Or, directly $\dfrac{\pi\cdot 4^{2}}{\pi\cdot 1^{2}} = 16$

texaschic101 · Answer

I am not sure if this is correct, but it says proportional....I am going to make a proportion.
10/2 = x/8 ($10 to 2 in = $x to 8 inches)
cross multiply
(2)(x) = (10)(8)
2x = 80
x = 40

Like I said, I am not sure if this is correct, so you will need another opinion.

tkhunny · Answer

No, @texaschic101, the proportion is in the AREA, not he Diameter.

texaschic101 · Answer

sorry.....I tried :(