Math.PI; Math.pow

Week 3: Objects, files and exceptions/15a Math-library

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+https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Math.html
+variety of mathematical operations, such as 
+trigonometric functions, 
+the square root and 
+mathematical constants. 
+The Math library is also part of the basic Java package, so there is no need to import it separately.
+
+The example method calculates the area of a sphere by retrieving the pi from the Math class and the method pow, which can be used to calculate exponents:
+
+ 
+
+public static double ballArea(double radius) {
+    return 4 * Math.PI * Math.pow(radius, 2);
+}
+
+
+
+