What is the formula for the surface area of a triangle?

The formula for the surface area of a triangle is derived from the basic geometric principles regarding the dimensions of a triangle. The area of a triangle is calculated by taking half of the base (one side of the triangle) multiplied by the height (the perpendicular distance from the base to the opposite vertex).

When expressed mathematically, the area can be simplified to:

Area = (Base * Height) / 2.

In the context of the choices provided, the formula (Length * Width) / 2 can be seen as a representation of this calculation if one interprets "Length" as the base of the triangle and "Width" as the height. Thus, this formula correctly reflects the calculation needed to find the area of a triangle. The dimensions named “Length” and “Width” might not traditionally be used in geometric definitions of a triangle, but in this question's context, they effectively fulfill the roles of base and height.

Understanding this calculation is fundamental for swimming pool operators, as it can be useful when calculating the area of triangular sections of a pool or surrounding features.