diff --git a/src/edu/wlu/cs/levy/cg/DistanceMetric.java b/src/edu/wlu/cs/levy/cg/DistanceMetric.java
index 7b443d2..b0f45b0 100644
--- a/src/edu/wlu/cs/levy/cg/DistanceMetric.java
+++ b/src/edu/wlu/cs/levy/cg/DistanceMetric.java
@@ -1,8 +1,6 @@
-// Abstract distance metric class
-
 package edu.wlu.cs.levy.cg;
 
-abstract class DistanceMetric {
+interface DistanceMetric {
 
-	protected abstract double distance(double[] a, double[] b);
+	double distance(double[] a, double[] b);
 }
diff --git a/src/edu/wlu/cs/levy/cg/EuclideanDistance.java b/src/edu/wlu/cs/levy/cg/EuclideanDistance.java
index 474c4fc..bb0bfd7 100644
--- a/src/edu/wlu/cs/levy/cg/EuclideanDistance.java
+++ b/src/edu/wlu/cs/levy/cg/EuclideanDistance.java
@@ -2,23 +2,18 @@
 
 package edu.wlu.cs.levy.cg;
 
-class EuclideanDistance extends DistanceMetric {
-
-	protected double distance(double[] a, double[] b) {
-
-		return Math.sqrt(sqrdist(a, b));
+public class EuclideanDistance implements DistanceMetric {
 
+	public double distance(double[] a, double[] b) {
+		return Math.sqrt(squaredDistance(a, b));
 	}
 
-	protected static double sqrdist(double[] a, double[] b) {
-
+	protected static double squaredDistance(double[] a, double[] b) {
 		double dist = 0;
-
 		for (int i = 0; i < a.length; ++i) {
 			double diff = (a[i] - b[i]);
 			dist += diff * diff;
 		}
-
 		return dist;
 	}
 }
diff --git a/src/edu/wlu/cs/levy/cg/HPoint.java b/src/edu/wlu/cs/levy/cg/HPoint.java
index 3274781..b44ba4b 100644
--- a/src/edu/wlu/cs/levy/cg/HPoint.java
+++ b/src/edu/wlu/cs/levy/cg/HPoint.java
@@ -34,8 +34,7 @@ protected boolean equals(HPoint p) {
 	}
 
 	protected static double sqrdist(HPoint x, HPoint y) {
-
-		return EuclideanDistance.sqrdist(x.coord, y.coord);
+		return EuclideanDistance.squaredDistance(x.coord, y.coord);
 	}
 
 	public String toString() {
diff --git a/src/edu/wlu/cs/levy/cg/HammingDistance.java b/src/edu/wlu/cs/levy/cg/HammingDistance.java
index cb1ae48..85d257c 100644
--- a/src/edu/wlu/cs/levy/cg/HammingDistance.java
+++ b/src/edu/wlu/cs/levy/cg/HammingDistance.java
@@ -2,9 +2,9 @@
 
 package edu.wlu.cs.levy.cg;
 
-class HammingDistance extends DistanceMetric {
+public class HammingDistance implements DistanceMetric {
 
-	protected double distance(double[] a, double[] b) {
+	public double distance(double[] a, double[] b) {
 
 		double dist = 0;