1. Method 1: Expand the surrounding surface into a rectangle with a length of 8× 4 = 32 cm and a width of 15 cm.

The area of trademark paper is 8× 4× 15 = 480 (square centimeter).

2. Method 2: The areas of four sides are equal, and the area of each side is 8× 15 = 120 (square centimeter).

The area of trademark paper is: 120× 4 = 480 (square centimeter).

A: The area of trademark paper is 480 square centimeters.