diff --git a/src/Prak1/TriangleChecker.java b/src/Prak1/TriangleChecker.java
new file mode 100644
index 0000000..c0f4ac9
--- /dev/null
+++ b/src/Prak1/TriangleChecker.java
@@ -0,0 +1,68 @@
+package Prak1;
+import java.util.Scanner;
+
+
+public class TriangleChecker {
+
+  public enum TriangleType {
+    NONE,
+    NORMAL,
+    ISOSCELES,  // Gleichschenklig
+    EQUILATERAL // Gleichseitig
+  }
+
+
+  public static void main(String[] args) {
+    Scanner s = new Scanner(System.in);
+    System.out.println("Geben Sie die Seitenlängen ein.");
+    float a = enterFloat(s, "a: ");
+    float b = enterFloat(s, "b: ");
+    float c = enterFloat(s, "c: ");
+    s.close();
+    printAnalysis(a, b, c);
+  }
+
+  // Eingabe einer Seitenlänge
+  private static float enterFloat(Scanner s, String prompt) {
+    System.out.print(prompt);
+    return s.nextFloat();
+  }
+
+  // Ausgabe der ermittelten Dreiecksart
+  private static void printAnalysis(float a, float b, float c) {
+    TriangleType type = checkTriangle(a, b, c);
+    switch (type) {
+      case NONE:
+        System.out.println("Kein Dreieck");
+        break;
+      case NORMAL:
+        System.out.println("Dreieck");
+        break;
+      case ISOSCELES:
+        System.out.println("Gleichschenkliges Dreieck");
+        break;
+      case EQUILATERAL:
+        System.out.println("Gleichseitiges Dreieck");
+        break;
+    }
+  }
+
+  // Analyse der Dreiecksart
+  public static TriangleType checkTriangle(float a, float b, float c) {
+    if ((a < 0 || b < 0 || c < 0) || ((a + b) < c || (b + c) < a) || (a + c) < b) {
+      return TriangleType.NONE;
+    } else {
+      if (a == b & b == c) {
+        return TriangleType.EQUILATERAL;
+      } else {
+        if (a == b || b == c || a == c) {
+          return TriangleType.ISOSCELES;
+        } else {
+          return TriangleType.NORMAL;
+
+        }
+      }
+    }
+  }
+  }
+
diff --git a/test/Prak1/TriangleCheckerTest.java b/test/Prak1/TriangleCheckerTest.java
index 5e55921..107c153 100644
--- a/test/Prak1/TriangleCheckerTest.java
+++ b/test/Prak1/TriangleCheckerTest.java
@@ -18,4 +18,8 @@ class TriangleCheckerTest {
     void checkTriangle_none() {
         assertEquals(TriangleChecker.TriangleType.NONE, TriangleChecker.checkTriangle(-10, 0, 10));
     }
+    @Test
+    void checkTriangle_gleichschenklig() {
+        assertEquals(TriangleChecker.TriangleType.ISOSCELES, TriangleChecker.checkTriangle(10, 10, 5));
+    }
 }
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