Given:
The dimensions of base are 5 cm and 5cm.
The height of the pyramid is 3 cm.
To find:
The volume of the pyramid.
Solution:
The volume of a pyramid is:
...(i)
Where, B is the base area and h is the height of the pyramid.
The base area of the given pyramid is:



Substituting
and
in (i), we get


Therefore, the volume of the given pyramid is 25 cm³. Hence, the correct option is A.