Am I right?

What is the exact circumference of a circle with a radius of 17 millimeters?

A. 8.5 π millimeters
B. 17 π millimeters

Question

Am I right? 

What is the exact circumference of a circle with a radius of 17 millimeters?
 
A. 8.5 π millimeters
B. 17 π millimeters <-- My Answer
C. 34 π millimeters
D. 68 π millimeters

jdoe0001 · Answer

http://dandumitrache.com/wp-content/uploads/2013/07/circumference-circle.png

jdoe0001 · Answer

or http://misscoult.edublogs.org/files/2012/05/Circle-formuasl-1pgad09.jpg

solomonzelman · Answer

$\Huge\color{blue}{ \sf    C= d }$$\Huge\color{blue}{ \bf   π }$

solomonzelman · Answer

$\Huge\color{blue}{ \sf     2r =d}$   so you are not right

mathmale · Answer

Please show how you obtained y our own answer, before asking for help.

anonymous · Answer

@mathmale Okay, my apolygizes I didn't know. :)

solomonzelman · Answer

Do you get why you were wrong?

anonymous · Answer

Yes I do thank you

solomonzelman · Answer

and what is the right answer ?

anonymous · Answer

I am thinking D. 68 π millimeters

solomonzelman · Answer

The formula for the Circumference is

$\Huge\color{blue}{ \sf     C=2πr }$

C - circumference
r- radius

you are given that the radius is 17mm, so
$\Huge\color{blue}{ \sf     C=2π(17) }$


$\Huge\color{orangered}{ \it     2π(17)=? }$

anonymous · Answer

34?

solomonzelman · Answer

Yeeah !

anonymous · Answer

Yay! I got it right?!

solomonzelman · Answer

$\Huge\color{magenta}{ \rm   you~~~got~~this~~;) }$

anonymous · Answer

Yay!! Thanks so much for the help

solomonzelman · Answer

Anytime !