Which is the correct calculation for the volume of the pyramid?

1/3 A h.

Step-by-step explanation:

The volume of a pyramid is 1/3 * area of the base * height = 1/3 A h.

So for example the area of a square-based pyramid = 1/3 s^2 h where s is the length of a side of the square.

h*a²*1/3

Step-by-step explanation:

where h is the vertical height of pyramid a is the length of base ... this formula is applicable for square based pyramid only.