![]() It is important to know the difference between 3D shapes. It is also common to confuse the volume of a pyramid with the volume of a prism. To find the area of a triangular face we use the perpendicular height of the triangular face. To find the volume of the pyramid we use its perpendicular height. The height of the shape needs to be the perpendicular height. To calculate the volume or surface area of a pyramid, we need to know certain lengths within the pyramid. However, the volume of a cone is still equal to V=\frac As a pyramid has a polygonal base, the base cannot be a circle as a circle is not a polygon. The base can be an irregular polygon and if the apex is not over the centre of the polygon, we call the pyramid and oblique pyramid.Ī circle is not a polygon as a polygon has a finite number of edges, connected by vertices. The base of the pyramids does not need to be a regular polygon. A triangular pyramid can also be called a tetrahedron, we can have different types of pyramids such as square based pyramids (like the Egyptian Pyramids), pentagonal pyramids, hexagonal pyramids etc. A pyramid is a three dimensional shape made up of flat faces: a polygon base and triangular lateral faces which meet at a point, called the apex.
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