import math java
import java.lang.Math.*;
// usage
double radius = 15;
double area = Math.PI * radius * radius;
import math java
import java.lang.Math.*;
// usage
double radius = 15;
double area = Math.PI * radius * radius;
math class in java
double roundedDown = Math.round(23.445);
double roundedUp = Math.round(23.545);
// rounds up and down from float or double
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