Add Euclidean Distance Formula (#3047)

src/main/java/com/thealgorithms/maths/DistanceFormula.java

@@ -0,0 +1,11 @@
+package com.thealgorithms.maths;
+
+public class DistanceFormula {
+	public static double distance(double x1, double y1, double x2, double y2)
+	{
+		double dX = Math.pow(x2-x1, 2);
+		double dY = Math.pow(y2-x1, 2);
+		double d = Math.sqrt(dX+dY);
+		return d;
+	}
+}

src/test/java/com/thealgorithms/maths/DistanceFormulaTest.java

@@ -0,0 +1,28 @@
+package com.thealgorithms.maths;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class DistanceFormulaTest
+{
+  @Test
+  void test1()
+  {
+    Assertions.assertEquals(DistanceFormula.distance(1,1,2,2), 1.4142135623730951);
+  }
+  @Test
+  void test2()
+  {
+    Assertions.assertEquals(DistanceFormula.distance(1,3,8,0), 7.0710678118654755);
+  }
+  @Test
+  void test3()
+  {
+    Assertions.assertEquals(DistanceFormula.distance(2.4,9.1,55.1,100), 110.91911467371168);
+  }
+  @Test
+  void test4()
+  {
+    Assertions.assertEquals(DistanceFormula.distance(1000,13,20000,84), 19022.067605809836);
+  }
+}