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JavaScript JavaScript Foundations Numbers The Math Object

Posted by James Lines
James Lines
10,420 Points

Possible Bug

I think there may be a bug here.

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.

Provided code:

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);

My answer:

var circumference = math.PI(diameter);

Shows as incorrect, and this explanation is given: Bummer! No variable named "circumference" has been defined. Make sure to declare the variable like: var circumference =...

Note: I noticed incorrect syntax can cause strange hint messages, but I am almost certain I have this correct.

4 Answers

eirikvaa
eirikvaa
18,015 Points

Remember that Math.PI is a constant, not a function. You must multiply it by the diameter instead of passing it as an argument.

James Lines
James Lines
10,420 Points
James Lines
James Lines
10,420 Points

like this: var circumference = math.PI() * diameter;

eirikvaa
eirikvaa
18,015 Points

No, like this:

var circumference = Math.PI * diameter;
James Lines
James Lines
10,420 Points
James Lines
James Lines
10,420 Points

Ok that did it. Perhaps I should pay better attention!! Thanks Eirik!!

eirikvaa
eirikvaa
18,015 Points

No problem, glad to help.

Ann Zerega
Ann Zerega
349 Points
Ann Zerega
Ann Zerega
349 Points

Need help here - I tried var circumference = Math.PI * diameter; and got the error = "Bummer! No variable named "circumference" has been defined. Make sure to declare the variable like: var circumference =..." using Safari browser in case that's relevant.