Question

The formula to find r is (A/pi)^1/2 If A=54cm^2 and pi=22/7, what is r?

Answer 1

Here to make it more clear: \[\left(\begin{matrix}A \\ \pi\end{matrix}\right)^.5\]

A = 54 centimeters^2
and pi = 22/7
Find r

Answer 2

I keep getting 30.46010 but that is not one of my multiple choice options

Answer 3

Can you show work? I don't see how you got 30.460...?

Answer 4

yeah
(54^2/(22/7))^1/2
(2961/(22/7))
2961/3.142 ^1/2
942.393^1/2
r = 30.698

omg what the heck? lol I got a slightly different answer that time -_-

Answer 5

@geerky42 did youget my message

Answer 6

"54^2"

Oh that's why you got wrong answer. You don't square 54, it's just that unit is squared \(cm^2\)

Answer 7

Should be (54/(22/7))^1/2

Answer 8

@geerky42 really? :O oh let me try that

Answer 9

Yep. \(54~cm^2\neq54^2~cm^2\) or something

Answer 10

ok I got 4.15 but that isn't one of my multiple choice options!

Answer 11

Really? what are options?

Answer 12

my options are
7
7^(1/2)
14

Answer 13

@geerky42 do you want me to show you the screenshot?

Answer 14

Are you sure? Because none of them are correct?

Answer 15

Sure

Answer 16

oops

Answer 17

its a 2-part question
the first part was asking for the formula to find r given this formula: A=pir^2
So maybe i got that first part wrong

Answer 18

It is correct that \(r = \sqrt{\dfrac{A}{\pi}}\)

Answer 19

i think it is but it doesnt tell me

Answer 20

Should be right. Is there any report button or something? Or can you contract teacher to double check this question?

Answer 21

no theres not, but this isnt the fist time I found an error in one of their tests! i'll try contacting one of the teachers

Answer 22

Okay, I would recommend that.