$\"\"$

The formula for the surface area S of a regular pyramid is $\"\"$ where P is the perimeter of the base, l is the slant height, and B is the area of the base.

Observe the pyramid, the base is square and the length of the side (s) of a square is 5 centimeter.

Substitute the value of $\"\"$ in the formula for the perimeter of a square or $\"\"$ .

$\"\"$ .

Substitute the value of $\"\"$ in the formula for the are of a square or $\"\"$ .

$\"\"$ . $\"\"$

Substitute the value of $\"\"$ in the formula for the surface area S of a regular pyramid is $\"\"$ .

$\"\"$

$\"\"$ . $\"\"$

The surface area of the square pyramid is $\"\"$ .