diff --git a/pai9.jpg b/pai9.jpg
new file mode 100644
index 0000000..8cee1ff
--- /dev/null
+++ b/pai9.jpg
Binary files differ
diff --git a/pai9.rb b/pai9.rb
new file mode 100644
index 0000000..f7cae5e
--- /dev/null
+++ b/pai9.rb
@@ -0,0 +1,21 @@
+#!/usr/bin/env ruby
+#-*- coding: utf-8 -*-
+
+enshuritsu = 0.0
+x = 0
+
+while x < 10000000
+
+ y = 4 * x + 1
+ 
+ z = 4 * x + 3
+ 
+ enshuritsu = enshuritsu + (1.0 / y) - (1.0 / z).to_f
+ x = x + 1
+end
+
+printf("%d回 円周率 %.20f\n",x,enshuritsu * 4.0)
+
+
+
+
diff --git a/pai9kekka.txt b/pai9kekka.txt
new file mode 100644
index 0000000..9e2f1b3
--- /dev/null
+++ b/pai9kekka.txt
@@ -0,0 +1,15 @@
+10回 円周率 3.09162380666783986882
+
+100回 円周率 3.13659268483881614742
+
+1000回 円周率 3.14109265362104128627
+
+10000回 円周率 3.14154265358982476286
+
+100000回 円周率 3.14158765358976177495
+
+1000000回 円周率 3.14159215358972421228
+
+10000000回 円周率 3.14159260358981695660
+
+100000000回 円周率 3.14159264858940767695