From a37210c52a34a78990e720087f3c5fe5e26884f8 Mon Sep 17 00:00:00 2001
From: Fdai7396 <batuhan.agkaya@informatik.hs-fulda.de>
Date: Tue, 7 Feb 2023 18:39:56 +0100
Subject: [PATCH] add dreieckFlaeche

---
 src/funktion.c | 4 ++++
 src/funktion.h | 1 +
 src/main.c     | 7 +++++++
 3 files changed, 12 insertions(+)

diff --git a/src/funktion.c b/src/funktion.c
index c03a8e4..15436ad 100644
--- a/src/funktion.c
+++ b/src/funktion.c
@@ -323,4 +323,8 @@ double kreisFlaeche(double r) {
 }
 double kreisUmfang(double r) {
     return 2 * M_PI * r;
+}
+double dreieckFlaeche(double a, double b, double c) {
+    double s = (a + b + c) / 2;
+    return sqrt(s * (s - a) * (s - b) * (s - c));
 }
\ No newline at end of file
diff --git a/src/funktion.h b/src/funktion.h
index 74bce7d..5b06b9a 100644
--- a/src/funktion.h
+++ b/src/funktion.h
@@ -55,5 +55,6 @@ double prozentsatz(double ein, double prozent);
 double grundwert(double ein, double prozent);
 double kreisFlaeche(double r);
 double kreisUmfang(double r);
+double dreieckFlaeche(double a, double b, double c);
 
 #endif
diff --git a/src/main.c b/src/main.c
index b48933b..2eb00cf 100644
--- a/src/main.c
+++ b/src/main.c
@@ -248,4 +248,11 @@ int main()
 
     r = getValue('r');
     kreisUmfang(r);
+
+    a = getValue('a');
+    b = getValue('b');
+    c = getValue('c');
+    dreieckFlaeche(a,b,c);
+    double s = (a + b + c) / 2;
+    printf("Die Flaeche des Dreiecks betraegt: %f\n", sqrt(s * (s - a) * (s - b) * (s - c)));
 }