A pyramid in which the apothem (slant height along the bisector of a face) is equal to times the semi-base (half the base width) is sometimes called a "golden pyramid". The isosceles triangle that is the face of such a pyramid can be constructed from the two halves of a diagonally split golden rectangle (of size semi-base by apothem), joining the medium-length edges to make the apothem. The height of this pyramid is formula_78 times the semi-base (that is, the slope of the face is formula_78); the square of the height is equal to the area of a face, times the square of the semi-base.