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The class java.lang.Math defines a large set of numeric constants, such as PI and the exponential constant E. Prefer the use of predefined constants when the they are available.
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double area(double radius) {
return 4.0 * Math.PI * radius * radius; }
double volume(double radius) {
return 4.0/3.0 * Math.PI * radius * radius * radius; }
double greatCircleCircumference(double radius) {
return 2 * Math.PI * radius; }
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