Question

Which expression can be used to find the area of a circle with a diameter of 80 cm?








A.

π · 402








B.

π · 160








C.

π · 80








D.

π · 40

I think d

Answer 1

radius = half the diameter

Answer 2

so it is d

Answer 3

area = pi r^2

Answer 4

Pi R^2

Answer 5

a

Answer 6

not d

Answer 7

80/2

Answer 8

none of those choices are correct

Answer 9

I don't know why its what k12 says

Answer 10

unless 402 means 40^2

Answer 11

use ^ if you mean the number is taken to a power

Answer 12

as its written it could mean 4 hundred and 2

Answer 13

ssoo a?

Answer 14

i guess so.

Answer 15

That is wrong

Answer 16

1600

Answer 17

402 means 40 to the second power

Answer 18

as i sais it should be pi 40^2 or 1600 pi

Answer 19

its a

Answer 20

well dont write it that way 40 to the power 2 is 40^2

Answer 21

- how is anyone going to know that?