What is the exact area of a circle whose diameter is 18 cm?

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What is the exact area of a circle whose diameter is 18 cm?

Mathematics
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formula A = pi*r^2 pi = 3.14 approximately r = radius = half of diameter
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ok so each answer is in terms of pi, so ignore the pi's for now

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Other answers:

whats the radius?
18 divided by 2
diameter = 18 radius = half of diameter
so 9
yep
then you plug that into A = pi*r^2
3.14 x 18
\[3.14 \times 8 \times 8 \]
200.96
divide it by 2?
Wait... Let me try this again...
again, ignore the pi's
every answer choice has a pi in it
8x8 = 64
but you found the radius to be 9, not 8
9 x 8 = 72
r^2 means r times r
r = 9
9 x8 x8 ?
576
idk how you're getting 9 x 8
r^2 = r x r = 9 x 9 = ?? I replaced the 'r's with 9 since the radius is 9
81?
yep so 81pi is your answer
Thank you!!!!

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