Mark the right statements.
1. The lateral surfaces of a pyramid are triangles with a common vertex.
2. A pyramid is a special case of a prism.
3. Volume of a pyramid = 1/3 x base area x vertical height
4. Volume of a prism = 1/2 base area x height

Pyramid: A geometric solid with one base that is a polygon and all other faces are triangles with a common vertex.

 Prism: A geometric solid with two bases that are congruent, parallel polygons and all other faces are parallelograms. It is referred to as a right prism if the faces are rectangles.

 Volume of a pyramid = 1/3 x base area x vertical height

Volume of a prism = base area x vertical height

1 and 3 are the correct statements