diff --git a/src/funktion.c b/src/funktion.c
index 88ea51e..57bfdf9 100644
--- a/src/funktion.c
+++ b/src/funktion.c
@@ -330,4 +330,7 @@ double dreieckFlaeche(double a, double b, double c) {
 }
 double dreieckUmfangn(double a, double b, double c) {
     return a + b + c;
+}
+double viereckFlaeche(double a, double b) {
+    return a * b;
 }
\ No newline at end of file
diff --git a/src/funktion.h b/src/funktion.h
index cab2fed..a462b49 100644
--- a/src/funktion.h
+++ b/src/funktion.h
@@ -57,5 +57,6 @@ double kreisFlaeche(double r);
 double kreisUmfang(double r);
 double dreieckFlaeche(double a, double b, double c);
 double dreieckUmfangn(double a, double b, double c);
+double viereckFlaeche(double a, double b);
 
 #endif
diff --git a/src/main.c b/src/main.c
index 4d6cb2b..0643dd0 100644
--- a/src/main.c
+++ b/src/main.c
@@ -258,4 +258,9 @@ int main()
     b = getValue('b');
     c = getValue('c');
     dreieckUmfangn(a,b,c);
+
+    a = getValue('a');
+    b = getValue('b');
+    viereckFlaeche(a,b);
+    printf("Der Flaecheninhalt des Vierecks betraegt: %lf\n", a * b);
 }