The belt buckle is shown as comprising of a rectangle and two triangles.
The rectangle has dimensions, 3 inches by 1.5 inches. The triangle has dimensions 1.5 inches (base) by 1.5 inches (vertical height).
The area of the rectangular portion is;
The area of the triangular portion is;
The total area of the belt buckle is therefore,
Area = 4.5 + 2.25
Area = 6.75 inches squared