## anonymous one year ago hi there, please help. thx <3 A circular picture is 8 inches in diameter. Part A What is the area of the picture in square inches? A. 4π square inches B. 8π square inches C. 16π square inches D. 32π square inches

1. anonymous

@ganeshie8

2. ChillOut

$A_{circle}=\pi*r^{2}.$ where r is the radius. You were given the diameter, which is 2 times the lenght of the radius.

3. anonymous

hes got it

4. anonymous

ok so i do 2x the length of the radius and then i'll get my answer, right? @ChillOut

5. ChillOut

You take half of the lenght of the diameter, which in this case is 8. The radius is 4.

6. anonymous

wait so my answer is 4 or i multiply it by four? sry i'm confused :b

7. ChillOut

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8. anonymous

ok so would my answer be D.?

9. ChillOut

You plug 4 in the equation I presented you, I.E. $A_{circle}=\pi*(8/2)^{2}= 64/4*\pi$

10. anonymous

ok so i did 60/4 and got 16

11. anonymous

so now i multiply it x pie right?

12. anonymous

hold on nvm :b i got confused

13. anonymous

$Acircle= \pi \frac{ (dia)^2 }{ 4 }\\A= \pi \frac{ 8^2 }{ 4} inch^2\\A= \pi \frac{ 64 }{ 4 } inch^2\\A=16\pi\ inch^2\\ \therefore\ option\ C\ is\ Correct.$

14. ChillOut

Yes. Another way to write the equation is $$A_{circle}=\pi*(\frac{ d }{ 2 })^{2}$$ where "d" is the diameter of the circle.

15. anonymous

thank u guys! sry i went out :b