Eight - four around the base, and one at each corner of the base converging to a point.
A square has four straight lines.
a square based pyrmaid has 24 lines of symitry
24
a pyramid has 4 straight edges
A flat (2D) shape triangle has 3 straight edges. A triangular pyramid has 6 straight edges. A square pyramid has 8 straight edges. (Note, some vertical edges have already been counted as you move from one face to the next.)
8 straight sides
A square has four straight lines.
8
24
24
24
Two pairs.
24
a square based pyrmaid has 24 lines of symitry
One. Vertical through the apex.
A square pyramid has no curved edges; it consists of eight edges in total, which are all straight. There are four edges forming the base (the square) and four edges connecting the apex to each vertex of the base. Thus, the square pyramid is characterized by its straight edges and flat faces.
A square base pyramid has 8 perpendicular lines. These include the 4 edges of the square base perpendicular to each other and the 4 edges connecting the apex of the pyramid to each vertex of the base, which are also perpendicular to the base.