diff --git "a/JHLEE325/202509/16 BOJ G4 \354\202\254\353\213\244\353\246\254.md" "b/JHLEE325/202509/16 BOJ G4 \354\202\254\353\213\244\353\246\254.md"
new file mode 100644
index 00000000..5cf547b7
--- /dev/null
+++ "b/JHLEE325/202509/16 BOJ G4 \354\202\254\353\213\244\353\246\254.md"	
@@ -0,0 +1,35 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static double x, y, c;
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        x = Double.parseDouble(st.nextToken());
+        y = Double.parseDouble(st.nextToken());
+        c = Double.parseDouble(st.nextToken());
+
+        double left = 0.0;
+        double right = Math.min(x, y);
+        double ans = 0.0;
+
+        for (int i = 0; i < 10000; i++) {
+            double mid = (left + right) / 2.0;
+            double h1 = Math.sqrt(x * x - mid * mid);
+            double h2 = Math.sqrt(y * y - mid * mid);
+            double tempc = (h1 * h2) / (h1 + h2);
+            if (tempc >= c) {
+                ans = mid;
+                left = mid;
+            } else {
+                right = mid;
+            }
+        }
+
+        System.out.printf("%.3f\n", ans);
+    }
+}
+```