Calculate the area of the circle whose diameter is 6 km. Note: you will need the radius. Please round to the nearest square kilometer.
my answer was
first to find the radius we divide the diameter in half
6/2= 3
so the radius is 3 so now we times that by
x 32 =
then i simlifly it to
9
then i subsitute 3.14 for
9 x 3.14 = 28.2
the area is exactly 9 or about 28.8 centimeters
but my teacher says i need to rounded and the units should be squared

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pi (3)^2 is right for the area of the circle

the area is exactly 9pi; the approximation is then 28.2

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