help

A wheel has a diameter of 21 inches.

Approximately how far does it travel in 3 revolutions?

A.
63 in.

B.
65.94 in.

C.
98.91 in.

D.
197.82 in.

I got 197.91

Question

help 


A wheel has a diameter of 21 inches. 

Approximately how far does it travel in 3 revolutions?
	
	
 
A.
	63 in.
	
 
B.
	65.94 in.
	
 
C.
	98.91 in.
	
 
D.
	197.82 in. 

I got 197.91

anonymous · Answer

@agent0smith

anonymous · Answer

@KendrickLamar2014

agent0smith · Answer

Do you know what a revolution means? 

Find the distance of one revolution.

anonymous · Answer

I know that it means rotation 

The formula for a circle is C=d pi, so times it by 3, right?

agent0smith · Answer

Yep.

anonymous · Answer

I did that and got 197.91, yet the answer choice is 197.87 idk what I did wrong

agent0smith · Answer

Did you use 3.14 or the actual value of pi?

anonymous · Answer

actual value of pi, I'm guessing that's why I got it wrong :c

anonymous · Answer

Thanks @agent0smith !

agent0smith · Answer

Well that doesn't make sense, since 3.14 is smaller than pi

agent0smith · Answer

Wait nvm, yeah when you use 3.14 you get their answer

You're welcome.