function area_of_circle(r, pi) {
var area;
if (arguments.length === 1) {
pi = 3.14;
area = pi * r * r;
} else {
}
return area;
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AD兔斯基
function area_of_circle(r, pi) {
var area;
if (arguments.length === 1) {
pi = 3.14;
area = pi * r * r;
} else {
area = pi * r * r;
}
return area;
}