From 9820a50b69eef83f63b64b3d3a3b586f1b810351 Mon Sep 17 00:00:00 2001
From: 180Sai <92890058+180Sai@users.noreply.github.com>
Date: Fri, 30 Oct 2026 14:20:55 -0400
Subject: [PATCH] Add pyramid surface area calculation

---
 .../java/com/thealgorithms/maths/Area.java    | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/main/java/com/thealgorithms/maths/Area.java b/src/main/java/com/thealgorithms/maths/Area.java
index 84fc67159379..9c6daca249be 100644
--- a/src/main/java/com/thealgorithms/maths/Area.java
+++ b/src/main/java/com/thealgorithms/maths/Area.java
@@ -232,4 +232,24 @@ public static double surfaceAreaCone(final double radius, final double height) {
         }
         return Math.PI * radius * (radius + Math.pow(height * height + radius * radius, 0.5));
     }
+    
+    /**
+      * << NEW >>
+      * Calculate the surface area of a pyramid with a square base.
+      *
+      * @param sideLength side length of the square base
+      * @param slantHeight slant height of the pyramid
+      * @return surface area of the pyramid
+      */
+    public static double surfaceAreaPyramid(final double sideLength, final double slantHeight) {
+      if (sideLength <= 0) {
+        throw new IllegalArgumentException("Must be a positive sideLength");
+      }
+      if (slantHeight <= 0) {
+        throw new IllegalArgumentException("Must be a positive slantHeight");
+      }
+      double baseArea = sideLength * sideLength;
+      double lateralSurfaceArea = 2 * sideLength * slantHeight;
+      return baseArea + lateralSurfaceArea;
+    }
 }