diff --git a/SelfEducation/Task/T4/6ticket/func.c b/SelfEducation/Task/T4/6ticket/func.c
new file mode 100644
index 0000000..8e81eb2
--- /dev/null
+++ b/SelfEducation/Task/T4/6ticket/func.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <math.h>
+#define N 6
+
+void print_revers(int x)
+{
+    int res = 0;
+    for (int i = N - 1; i > -1; i--)
+    {
+        res += (x / (int)pow(10, i)) * (int)pow(10, (N - 1 - i));
+        x = x % (int)pow(10, i);
+        printf("%d | %d\n", x, res);
+    }
+
+    printf("%d\n", res);
+}
\ No newline at end of file
diff --git a/SelfEducation/Task/T4/6ticket/main.c b/SelfEducation/Task/T4/6ticket/main.c
new file mode 100644
index 0000000..63ea1cb
--- /dev/null
+++ b/SelfEducation/Task/T4/6ticket/main.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+void print_revers(int x);
+
+int main()
+{
+    int x;
+
+    scanf("%d", &x);
+
+    print_revers(x);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/SelfEducation/Task/T4/6ticket/out/6t_app b/SelfEducation/Task/T4/6ticket/out/6t_app
new file mode 100755
index 0000000..494aea4
Binary files /dev/null and b/SelfEducation/Task/T4/6ticket/out/6t_app differ
diff --git a/SelfEducation/Task/T4/dist/func.c b/SelfEducation/Task/T4/dist/func.c
new file mode 100644
index 0000000..23c191c
--- /dev/null
+++ b/SelfEducation/Task/T4/dist/func.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <math.h>
+#include <stdlib.h>
+
+float dist(int x1, int y1, int x2, int y2)
+{
+    float res, a, b;
+
+    a = abs(x1 - x2);
+    b = abs(y1 - y2);
+    res = sqrt(a * a + b * b);
+
+    return res;
+}
+
+float area_geron(int x1, int y1, int x2, int y2, int x3, int y3)
+{
+    float res, p, a, b, c;
+
+    a = dist(x1, y1, x2, y2);
+    b = dist(x2, y2, x3, y3);
+    c = dist(x1, y1, x3, y3);
+
+    p = (a + b + c) / 2;
+
+    res = sqrt(p * (p - a) * (p - b) * (p - c));
+
+    return res;
+}
\ No newline at end of file
diff --git a/SelfEducation/Task/T4/dist/main.c b/SelfEducation/Task/T4/dist/main.c
new file mode 100644
index 0000000..8e9b5c5
--- /dev/null
+++ b/SelfEducation/Task/T4/dist/main.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <math.h>
+
+float dist(int x1, int y1, int x2, int y2);
+float area_geron(int x1, int y1, int x2, int y2, int x3, int y3);
+
+int main()
+{
+    int x1, y1, x2, y2, x3, y3; // координаты точек
+    float len, area;            // длина
+
+    scanf("%d%d", &x1, &y1); // прочитали числа
+    scanf("%d%d", &x2, &y2);
+    scanf("%d%d", &x3, &y3);
+
+    area = area_geron(x1, y1, x2, y2, x3, y3);
+
+    printf("%.3f\n", area);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/SelfEducation/Task/T4/dist/out/dist_app b/SelfEducation/Task/T4/dist/out/dist_app
new file mode 100755
index 0000000..07ad1f5
Binary files /dev/null and b/SelfEducation/Task/T4/dist/out/dist_app differ
diff --git a/SelfEducation/Task/T4/fahr/func.c b/SelfEducation/Task/T4/fahr/func.c
index 7f65bb9..c56873e 100644
--- a/SelfEducation/Task/T4/fahr/func.c
+++ b/SelfEducation/Task/T4/fahr/func.c
@@ -4,7 +4,16 @@ float fahr(int cel)
 {
     float res;
 
-    res = cel * 9 / 5 + 32;
+    res = (float)cel * 9 / 5 + 32;
+
+    return res;
+}
+
+float celsius(int fahr)
+{
+    float res;
+
+    res = ((float)fahr - 32) * 5 / 9;
 
     return res;
 }
\ No newline at end of file
diff --git a/SelfEducation/Task/T4/fahr/main.c b/SelfEducation/Task/T4/fahr/main.c
index f3152a5..eeddea0 100644
--- a/SelfEducation/Task/T4/fahr/main.c
+++ b/SelfEducation/Task/T4/fahr/main.c
@@ -1,16 +1,18 @@
 #include <stdio.h>
-#include "func.c"
 
 float fahr(int cel);
+float celsius(int fahr);
 
 int main()
 {
-    int cel; // градусы Цельсия
-    float f; // градусы Фаренгейта
+    int cel;      // градусы Цельсия
+    float f, ans; // градусы Фаренгейта
 
     scanf("%d", &cel);
     f = fahr(cel);
     printf("%.2f\n", f); // .2f - печатать с точностью до 2 знаков после .
 
+    ans = celsius((int)f);
+    printf("%.2f\n", ans);
     return 0;
 }
\ No newline at end of file
diff --git a/SelfEducation/Task/T4/fahr/out/fahr_app b/SelfEducation/Task/T4/fahr/out/fahr_app
new file mode 100755
index 0000000..3f3ce10
Binary files /dev/null and b/SelfEducation/Task/T4/fahr/out/fahr_app differ