hi there, please help. thx

Question

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

anonymous · Answer

@ganeshie8

chillout · Answer

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

anonymous · Answer

hes got it

anonymous · Answer

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

chillout · Answer

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

anonymous · Answer

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

chillout · Answer

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anonymous · Answer

ok so would my answer be D.?

chillout · Answer

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