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JavaScript JavaScript Foundations Numbers The Math Object

Posted by Reagan Schiller
Reagan Schiller
10,072 Points

what am I doing wrong? 

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);
     var    chance = (Math.random () * 20);
Dave McFarland
Dave McFarland
Treehouse Teacher
Dave McFarland
Dave McFarland
Treehouse Teacher

Hi Reagan Schiller

To put code into a forum post use triple back ticks -- ``` -- not triple single quotes -- '''.

I fixed your code in this discussion, but in the future here's a forum discussion that describes how to add HTML, CSS, JavaScript or other code to the forum: https://teamtreehouse.com/forum/posting-code-to-the-forum

1 Answer

Hayden Taylor
Hayden Taylor
5,076 Points
Hayden Taylor
Hayden Taylor
5,076 Points

The answer is

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

Because the formula for circumference is 2 * PI * Radius; so you must divide the diameter by 2 to get the correct R value.

also answered here --> http://teamtreehouse.com/forum/create-a-variable-named-circumference-and-assign-the-correct-value-to-it-by-using-the-diameter-variable-and-mathpi-2