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diff --git a/src/main/scala/sims/util/Polar.scala b/src/main/scala/sims/util/Polar.scala
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+++ b/src/main/scala/sims/util/Polar.scala
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+/*
+ * Simple Mechanics Simulator (SiMS)
+ * copyright (c) 2009 Jakob Odersky
+ * made available under the MIT License
+*/
+
+package sims.util
+
+import sims.geometry._
+import scala.math._
+
+/**Polar coordinates.*/
+case class Polar(distance: Double, angle: Double) {
+  
+  /**Returns the vector representation of these polar coordinates.*/
+  def toCarthesian = Vector2D(distance * sin(angle), distance * cos(angle))
+}