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# Numbers - The Math Operator (Code Challenge)

Hey guys,

I am really struggling with Math Operator (https://teamtreehouse.com/library/the-math-object) code challenge.

Here's the question

Create a variable named "circumference" and assign the correct value to it by using the "diameter" variable and Math.PI. See the comment in the script for more information.

I'm definitely not a numbers guy and I'm actually finding this code challenge quite frustrating, and it is putting a sour taste in my mouth towards JavaScript.

Any advice or code snippets would be greatly appreciated!

Many thanks

Stu :)

Hello Cowley,

Do not get frustrated. Keep calm my friend. Math.PI is a method that stores the number pi(3.14.......). And the diameter has already been created in the challenge. The formula for Circumference is:

```diameter x PI
```

And so we use this formula to formulate our code. Like so:

```var circumference = diameter * Math.PI;
```

Hope this helped. :)

Hey Guled A (sweet profile pic btw)

Thank you very much for your help and it worked a real treat. I get it now, it's amazing what an awesome community of fellow Treehousers and a very strong coffee will do!

Thanks again for your prompt help!

Stu :D

No problem. :)

• 1

I learnt more from your example and detail than just pasting the answer. Sometimes no-one likes math!

Wow.! I was trying

var circumference = diameter * Math.PI();

Javascript var circumference = Math.PI(diameter)```

```Because diameter is a floating point number.
started getting scared, when I tried that, and it did not work. I finally passed because of your answer, but I need to keep going over this and also dive into bookmarks to make sure I totally get this. Don't feel confident, yet. I don't know if I would have thought to remove the parenthesis from the end of the constant Math.PI  :-(   */

How did you know to not use the parenthesis? I need to think different, if I am going to really get this.I apologize in advance for any errors in my markdown... I'm so tired. I just wanted to complete this before I even attempted sleep.  lol
 I can't even get markdown working.
```

Math.PI holds the value pie. If you put parenthesis next to it, you would be making it call a function (which does not exist). Also, in the exercise there was a comment below the practice area in which had the method without any parenthesis. It is ok to miss a few things at times, that is what practice is for. Do not ever feel disappointed, tell yourself "I got this!", and make an effort.

``` Math.PI
Approximately 3.14159. Pi (?) is used
to determine the circumference of a circle
given its diameter by multiplying the diameter
by ?. Geometery refresher: the circumference
of a circle is the distance around the outside
edge. The diameter is the width of the circle.
```

Thanks, Guled A! Plowing through, I gain a little bit of confidence each time. I love Treehouse and how much I am learning here!