Question

What is the exact area of a circle with diameter 1 mile?

pi divided by 4 square miles

pi divided by 2 square miles

pi square miles

2 times pi square miles

Answer 1

If the diameter is 1, what is the radius?

Answer 2

a = pi * r^2

d = 2r
1 mi = 2r
r = .5 mi

a = pi * .25 mi

Answer 3

i dont know?

Answer 4

can you show me how to do it

Answer 5

Divide the diameter by 2 to find the radius.

Answer 6

1 divided by 2 is 1/2 and that is the radius.
Now square the radius. What is (1/2)^2 ???

Answer 7

0.25

Answer 8

yes. 1/4
Now to find the area multiply 1/4 by pi so :
\[A=\frac{\pi}{4}\]

Answer 9

Now pick the right answer from your list.

Answer 10

ok thanks

Answer 11

What did you pick?

Answer 12

its π4

Answer 13

1, 2, 3, or 4 ???

Answer 14

it's pi / 4 mi^2

Answer 15

it's an alias for pi * .25 mi^2, since .25 = 1/4, pi * 1/4 = pi / 4

Answer 16

its 4

Answer 17

"divided by" means "over"

Answer 18

So now which is the correct answer

Answer 19

pi divided by 4 square miles

Answer 20

That's better.

Answer 21

thanks

Answer 22

yw