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# Bummer! No variable named "circumference" has been defined?

Working on challenge task 1 of 4 on "The Math Object". Every time I try-

var circumference=

i get the error:

"Bummer! No variable named "circumference" has been defined. Make sure to declare the variable like: var circumference =..."

I have even tried copying and pasting, but nothing is working.

Thanks!

STAFF

Hey there,

In your email it said you were doing `Math.PI (diameter)` however `PI` is a property not a method on the `Math` object - look in this video http://teamtreehouse.com/library/javascript-foundations/numbers/the-math-object at 6:20.

Hope that helps :)

Thanks! i figured it out. I have no idea why it was taking me so long to get it. :P

I can't seem to get past here. I've been trying various combinations of the following;

var diameter = 5.75,

```      a = 17,
b = 42,
c = 1337,
ageIfILiveToYear2100 = (new Date(2100, 0, 1) - new Date(1995, 5, 16, 7, 20)) / (1000 * 60 * 60 * 24 * 365.242);
var circumference = Math.pi *diameter;
```

Where am I going wrong?

Tried this to;

var circumference = 2 * Math.pi * (diameter/2);

I think I'm missing the point

Never Mind, I got it Math.PI (pi must be in caps)