diff --git a/LabPSA_2/fourth.py b/LabPSA_2/fourth.py
new file mode 100644
index 0000000..435b78b
--- /dev/null
+++ b/LabPSA_2/fourth.py
@@ -0,0 +1,17 @@
+import random
+from numpy import pi, cos, sin, sqrt
+
+counter = 0
+for _ in range(100000):
+    (x1, y1) = (cos(random.uniform(0, 2*pi)), sin(random.uniform(0, 2*pi)))
+    (x2, y2) = (cos(random.uniform(0, 2 * pi)), sin(random.uniform(0, 2 * pi)))
+    (x3, y3) = (cos(random.uniform(0, 2 * pi)), sin(random.uniform(0, 2 * pi)))
+    len1 = sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2)
+    len2 = sqrt((x3 - x1) ** 2 + (y3 - y1) ** 2)
+    len3 = sqrt((x3 - x2) ** 2 + (y3 - y2) ** 2)
+    list1 = [len1, len2, len3]
+    list1.sort()
+    if list1[0] ** 2 + list1[1] ** 2 > list1[2] ** 2:
+        counter+=1
+print(counter/100000)
+