MYP Standard Mathematics Surface Area Key Definitions

The point where the triangular faces of a pyramid (or the curved surface of a cone) meet.

A 3D solid with a circular base and an apex (vertex). It is not a polyhedron because it has a curved surface.

A 3D solid that has only plane (flat) faces.

For a pyramid, the distance from the midpoint of a base edge to the apex, measured along a triangular face.

A 3D solid with one curved face; all points on its surface are equidistant from the center. It is not a polyhedron.

The total area of all the faces (or curved surfaces) on the outside of a 3-dimensional solid.

The perpendicular distance from the apex straight down to the base plane.

The amount of space a 3-dimensional solid occupies, measured in cubic units such as cm$^3$.