diff --git a/BangunDatar.java b/BangunDatar.java
new file mode 100644
index 0000000..77eacbb
--- /dev/null
+++ b/BangunDatar.java
@@ -0,0 +1,6 @@
+package com.dicoding.javafundamental.bangundatar;
+
+public interface BangunDatar {
+    public double luas(int s1, int s2);
+    public double keliling(int s1, int s2);
+}