feat: added surface calculations for pyramid

src/main/java/com/thealgorithms/maths/Area.java

@@ -76,17 +76,7 @@
      * @param slantHeight slant height of the pyramid
      * @return surface area of the given pyramid
      */
-    public static double surfaceAreaPyramid(final double sideLength, final double slantHeight) {
-        if (sideLength <= 0) {
-            throw new IllegalArgumentException("");
-        }
-        if (slantHeight <= 0) {
-            throw new IllegalArgumentException("slant height must be greater than 0");
-        }
-        double baseArea = sideLength * sideLength;
-        double lateralSurfaceArea = 2 * sideLength * slantHeight;
-        return baseArea + lateralSurfaceArea;
-    }
+
 
     /**
      * Calculate the area of a rectangle.
@@ -232,4 +222,15 @@
         }
         return Math.PI * radius * (radius + Math.pow(height * height + radius * radius, 0.5));
     }
-}
+    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;
+
+    }