NodeJS Slip 3A solution

//circle.js

var circle={
area: function(r)
{
var pi=3.14,a;
a=pi*r*r;
console.log('area of circle is:'+a);
},

circumference: function(r)
{
var pi=3.14,c;
c=2*pi*r;
console.log('circumference of circle is:'+c);
}
};

module.exports=circle

//mycircle.js

var mymod=require('./circle.js');
mymod.area(5);
mymod.circumference(5);