Which formula is used to calculate the area of a triangle?

The formula used to calculate the area of a triangle is specifically derived from the concept of base and height. The correct formula is the one that incorporates both the base of the triangle and its height in a way that reflects the unique properties of triangular shapes.

When calculating the area of a triangle, the formula takes half the product of the base length and the height, which is the perpendicular distance from the base to the opposite vertex. This is essential because a triangle can be thought of as half of a parallelogram when it is inscribed within one. Thus, the area calculation reflects that relationship by using the factor of one-half.

Using the formula as presented ensures you are accurately determining the space contained within the triangle's boundaries. In contrast, the other formulas provided do not correctly apply to triangles; for instance, the area calculation for rectangles or squares involves the length and width, which does not apply to the triangular form. Additionally, perimeter-based calculations do not yield area measurements and thus do not relate to finding a triangle's area.