In the latter case, the product of all elements equals "a".

In the 2-dimensional plane, right angles can be formed by two intersected lines which the product of their slopes equals to 1.

For a regular n-gon inscribed in a unit-radius circle, the product of the distances from a given vertex to all other vertices equals n.

Serious magazines are just better than they've been for a while - a hungry market plus better product equals a serious magazine boom.

And the product of the extremes equals the product of the means.

The product of the X and Y values of each point on the curve will equal the constant of proportionality (k).

In the neoclassical theory of competitive markets, the marginal product of labor equals the real wage.

The product of two sides of a triangle equals the altitude to the third side times the diameter of the circumcircle.

Profits can be maximised when the marginal product of labour equals the wage rate (marginal cost of production).

It may also be defined geometrically as the locus of points whose product of distances from two foci equals the square of half the interfocal distance.