7th Grade · Geometry
Pyramid
7.G.A.3
Definition
A 3D solid with one polygonal base and triangular lateral faces that meet at a single point called the apex. Named by the shape of the base.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
Examples
- A square pyramid has 1 square base + 4 triangular faces = 5 faces, 5 vertices, 8 edges.
- A triangular pyramid (tetrahedron) has 4 triangular faces, 4 vertices, 6 edges.
Key rule
Prism has 2 bases and no apex; pyramid has 1 base and 1 apex.
Memory hook
One base, triangles meeting at a point.