When calculating the area of geometric shapes, which formula is NOT applicable to a trapezoid?

In the context of calculating the area of a trapezoid, the formula that is not applicable is the one that involves the height multiplied by the base.

A trapezoid is a four-sided shape with at least one pair of parallel sides. The area of a trapezoid can be calculated using various formulas, but they must take into consideration the unique properties of its parallel sides and height.

The commonly accepted formula for the area of a trapezoid is given by 1/2 times the height times the sum of the lengths of the two parallel sides. This accurately captures the relationship between the trapezoid’s base dimensions and its height.

Using only height multiplied by one base, as suggested in the option that is not applicable, ignores the fact that trapezoids can have varying lengths across their bases. Therefore, that formula does not yield a correct area measurement for trapezoids. The essence of calculating the area of trapezoid shapes lies in recognizing the significance of both parallel bases and the height between them, rather than just one base measurement.