From c24a694891cbdc8e1b5fc122703639d9f51b3aa1 Mon Sep 17 00:00:00 2001
From: Hatter Jiang <jht5945@gmail.com>
Date: Thu, 24 Jul 2025 07:22:59 +0800
Subject: [PATCH] feat: add pow-pi-frac-6

---
 src/main/java/me/hatter/math/PowPiFrac6.java | 22 ++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 src/main/java/me/hatter/math/PowPiFrac6.java

diff --git a/src/main/java/me/hatter/math/PowPiFrac6.java b/src/main/java/me/hatter/math/PowPiFrac6.java
new file mode 100644
index 0000000..a68ea25
--- /dev/null
+++ b/src/main/java/me/hatter/math/PowPiFrac6.java
@@ -0,0 +1,22 @@
+package me.hatter.math;
+
+import me.hatter.math.util.MathUtil;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+
+public class PowPiFrac6 {
+
+    public static void main(String[] args) {
+        // 3.1415925580968211573577512694381765696389307918602926657455808746315469549319489862717519447616085936
+        System.out.println(pi());
+    }
+
+    public static BigDecimal pi() {
+        BigDecimal t = BigDecimal.ZERO;
+        for (long i = 1; i < 10000000; i++) {
+            t = t.add(BigDecimal.ONE.divide(BigDecimal.valueOf(i).pow(2), 1000, RoundingMode.HALF_UP));
+        }
+        return MathUtil.sqrt(t.multiply(BigDecimal.valueOf(6)), 100);
+    }
+}