Which expression is used to calculate the area enclosed by a rubber band forming a triangle?

The expression used to calculate the area enclosed by a triangle is indeed 1/2 times the base times the height, which is represented by the formula ( \frac{1}{2} bh ). In this formula, "b" refers to the length of the base of the triangle, and "h" refers to the height, which is the perpendicular distance from the base to the opposite vertex of the triangle.

When calculating the area of any triangle, this formula accounts for the fact that the area is essentially half of the rectangle that could be formed if you extended the base and height. The halves arise because a triangle occupies only half the space of the rectangle when both share the same base and height. Thus, using ( \frac{1}{2} bh ) properly provides you with the correct measure of the area contained within the triangle formed by the rubber band.

The other expressions cannot accurately represent the area of a triangle: ( b/h ) does not relate to area since it is a ratio, ( b + h ) merely adds the dimensions without providing an area measure, and ( bh ) signifies the area of the rectangle, not the triangle. Therefore, ( \frac{1}{2} bh )