diff --git a/03 Objektorientierung/02 Vererbung/04 Übung.ipynb b/03 Objektorientierung/02 Vererbung/04 Übung.ipynb
index 2ed3642..c7621bd 100644
--- a/03 Objektorientierung/02 Vererbung/04 Übung.ipynb	
+++ b/03 Objektorientierung/02 Vererbung/04 Übung.ipynb	
@@ -11,7 +11,7 @@
     "tags": []
    },
    "source": [
-    "# Vererbung in TypeScript – Geometrische Figuren\n",
+    "# Aufgabe 03.02.3 – Geometrische Figuren\n",
     "\n",
     "In diesem Notebook modellierst du **geometrische Figuren** mithilfe von **objektorientierter Programmierung** und **Vererbung**."
    ]
@@ -217,6 +217,127 @@
     "\n",
     "Warum ist es sinnvoll, die Methoden `umfang()` und `flaeche()` bereits in der Basisklasse `Figur` zu definieren, obwohl ihre konkrete Berechnung erst in den Unterklassen erfolgt?"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "d7dfe130-b4cb-48de-82b6-84f94ffa2591",
+   "metadata": {
+    "editable": false,
+    "slideshow": {
+     "slide_type": ""
+    },
+    "tags": []
+   },
+   "source": [
+    "## Automatische Tests\n",
+    "\n",
+    "Die folgenden Tests überprüfen, ob deine Klassen korrekt funktionieren.\n",
+    "\n",
+    "**Hinweis:** Führe diese Zelle erst aus, wenn alle Klassen implementiert sind."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "id": "fc097962-d40a-44e5-92c6-e214699686ac",
+   "metadata": {
+    "editable": false,
+    "slideshow": {
+     "slide_type": ""
+    },
+    "tags": []
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "03.01.3: Rechteck ... \u001b[0m\u001b[31mFAILED\u001b[0m \u001b[0m\u001b[38;5;245m(0ms)\u001b[0m\n",
+      "03.01.3: Kreis ... \u001b[0m\u001b[31mFAILED\u001b[0m \u001b[0m\u001b[38;5;245m(25ms)\u001b[0m\n",
+      "03.01.3: Quadrat ... \u001b[0m\u001b[31mFAILED\u001b[0m \u001b[0m\u001b[38;5;245m(0ms)\u001b[0m\n",
+      "\n",
+      "\u001b[0m\u001b[1m\u001b[37m\u001b[41m ERRORS \u001b[0m\n",
+      "\n",
+      "03.01.3: Rechteck \u001b[0m\u001b[38;5;245m=> <anonymous>:3:6\u001b[0m\n",
+      "\u001b[0m\u001b[1m\u001b[31merror\u001b[0m: AssertionError: Values are not equal.\n",
+      "\n",
+      "\n",
+      "    \u001b[90m\u001b[1m[Diff]\u001b[22m\u001b[39m \u001b[31m\u001b[1mActual\u001b[22m\u001b[39m / \u001b[32m\u001b[1mExpected\u001b[22m\u001b[39m\n",
+      "\n",
+      "\n",
+      "\u001b[31m\u001b[1m-   0\u001b[22m\u001b[39m\n",
+      "\u001b[32m\u001b[1m+   14\u001b[22m\u001b[39m\n",
+      "\n",
+      "  throw new AssertionError(message);\n",
+      "\u001b[0m\u001b[31m        ^\u001b[0m\n",
+      "    at \u001b[0m\u001b[1m\u001b[3massertEquals\u001b[0m (\u001b[0m\u001b[36mhttps://jsr.io/@std/assert/1.0.17/equals.ts\u001b[0m:\u001b[0m\u001b[33m65\u001b[0m:\u001b[0m\u001b[33m9\u001b[0m)\n",
+      "    at \u001b[0m\u001b[36m<anonymous>\u001b[0m:\u001b[0m\u001b[33m6\u001b[0m:\u001b[0m\u001b[33m3\u001b[0m\n",
+      "\n",
+      "03.01.3: Kreis \u001b[0m\u001b[38;5;245m=> <anonymous>:9:6\u001b[0m\n",
+      "\u001b[0m\u001b[1m\u001b[31merror\u001b[0m: AssertionError: Values are not equal.\n",
+      "\n",
+      "\n",
+      "    \u001b[90m\u001b[1m[Diff]\u001b[22m\u001b[39m \u001b[31m\u001b[1mActual\u001b[22m\u001b[39m / \u001b[32m\u001b[1mExpected\u001b[22m\u001b[39m\n",
+      "\n",
+      "\n",
+      "\u001b[31m\u001b[1m-   \u001b[41m\u001b[37mundefined\u001b[31m\u001b[49m\n",
+      "\u001b[22m\u001b[39m\u001b[32m\u001b[1m+   \u001b[42m\u001b[37mfunction\u001b[32m\u001b[49m\n",
+      "\u001b[22m\u001b[39m\n",
+      "\n",
+      "  throw new AssertionError(message);\n",
+      "\u001b[0m\u001b[31m        ^\u001b[0m\n",
+      "    at \u001b[0m\u001b[1m\u001b[3massertEquals\u001b[0m (\u001b[0m\u001b[36mhttps://jsr.io/@std/assert/1.0.17/equals.ts\u001b[0m:\u001b[0m\u001b[33m65\u001b[0m:\u001b[0m\u001b[33m9\u001b[0m)\n",
+      "    at \u001b[0m\u001b[36m<anonymous>\u001b[0m:\u001b[0m\u001b[33m10\u001b[0m:\u001b[0m\u001b[33m3\u001b[0m\n",
+      "\n",
+      "03.01.3: Quadrat \u001b[0m\u001b[38;5;245m=> <anonymous>:15:6\u001b[0m\n",
+      "\u001b[0m\u001b[1m\u001b[31merror\u001b[0m: AssertionError: Values are not equal.\n",
+      "\n",
+      "\n",
+      "    \u001b[90m\u001b[1m[Diff]\u001b[22m\u001b[39m \u001b[31m\u001b[1mActual\u001b[22m\u001b[39m / \u001b[32m\u001b[1mExpected\u001b[22m\u001b[39m\n",
+      "\n",
+      "\n",
+      "\u001b[31m\u001b[1m-   \u001b[41m\u001b[37mundefined\u001b[31m\u001b[49m\n",
+      "\u001b[22m\u001b[39m\u001b[32m\u001b[1m+   \u001b[42m\u001b[37mfunction\u001b[32m\u001b[49m\n",
+      "\u001b[22m\u001b[39m\n",
+      "\n",
+      "  throw new AssertionError(message);\n",
+      "\u001b[0m\u001b[31m        ^\u001b[0m\n",
+      "    at \u001b[0m\u001b[1m\u001b[3massertEquals\u001b[0m (\u001b[0m\u001b[36mhttps://jsr.io/@std/assert/1.0.17/equals.ts\u001b[0m:\u001b[0m\u001b[33m65\u001b[0m:\u001b[0m\u001b[33m9\u001b[0m)\n",
+      "    at \u001b[0m\u001b[36m<anonymous>\u001b[0m:\u001b[0m\u001b[33m16\u001b[0m:\u001b[0m\u001b[33m3\u001b[0m\n",
+      "\n",
+      "\u001b[0m\u001b[1m\u001b[37m\u001b[41m FAILURES \u001b[0m\n",
+      "\n",
+      "03.01.3: Rechteck \u001b[0m\u001b[38;5;245m=> <anonymous>:3:6\u001b[0m\n",
+      "03.01.3: Kreis \u001b[0m\u001b[38;5;245m=> <anonymous>:9:6\u001b[0m\n",
+      "03.01.3: Quadrat \u001b[0m\u001b[38;5;245m=> <anonymous>:15:6\u001b[0m\n",
+      "\n",
+      "\u001b[0m\u001b[31mFAILED\u001b[0m | 0 passed | 3 failed \u001b[0m\u001b[38;5;245m(27ms)\u001b[0m\n"
+     ]
+    }
+   ],
+   "source": [
+    "import { assertEquals } from \"jsr:@std/assert\"\n",
+    "\n",
+    "let _nr = \"03.01.3\"\n",
+    "Deno.test(`${_nr}: Rechteck`, () => {\n",
+    "    assertEquals(typeof Rechteck, 'function')\n",
+    "    const r = new Rechteck(4, 3)\n",
+    "    assertEquals(r.umfang(), 14)\n",
+    "    assertEquals(r.flaeche(), 12)\n",
+    "})\n",
+    "Deno.test(`${_nr}: Kreis`, () => {\n",
+    "    assertEquals(typeof Kreis, 'function')\n",
+    "    const k = new Kreis(1)\n",
+    "    assertEquals(Number(k.umfang().toFixed(2)), 6.28)\n",
+    "    assertEquals(Number(k.flaeche().toFixed(2)), 3.14)\n",
+    "})\n",
+    "Deno.test(`${_nr}: Quadrat`, () => {\n",
+    "    assertEquals(typeof Quadrat, 'function')\n",
+    "    const q = new Quadrat(5)\n",
+    "    assertEquals(q.umfang(), 20)\n",
+    "    assertEquals(q.flaeche(), 25)\n",
+    "})"
+   ]
   }
  ],
  "metadata": {