Counting and describing faces, edges, and vertices of 3D shapes.
Where your child meets this in real life: Describing 3D objects precisely, understanding packaging design
SEAGReady breaks describe 3d shape properties into 3 steps, taught in order so each skill builds on the last.
Count faces, edges, and vertices of shapes with all flat surfaces (cubes, cuboids, prisms, pyramids)
Identify faces, edges, and vertices of shapes with curved surfaces (cylinders, cones, spheres)
Given a description of faces, edges, and vertices, identify the 3D shape
Three free sample questions from our describe 3d shape properties course. Every question comes with a full explanation, and hints that guide without giving the answer away.
Niamh is describing a cereal box for her homework. How many faces does a cuboid have?
Answer: A. 6 faces
Faces are the flat surfaces of a 3D shape. A cuboid has: - Top and bottom (2 faces) - Front and back (2 faces) - Left and right (2 faces) Total: 6 faces
Stuck? Start here: Faces are the flat surfaces of the shape.
Ben is describing a tin of biscuits for his shape collection. How many faces does a cylinder have?
Answer: A. 2 faces
Only flat surfaces count as faces. A cylinder has: - 2 flat circular ends (these ARE faces) - 1 curved surface (this is NOT a face) Total: 2 faces
Stuck? Start here: Remember: only FLAT surfaces count as faces.
Conor reads a clue card: 'I have 6 faces, 12 edges, and 8 vertices. All my faces are the same size.' What shape is it?
Answer: A. Cube
The shape has 6 faces, 12 edges, and 8 vertices. This matches both cube and cuboid. But 'all faces are the same size' means all 6 faces are identical squares. Answer: Cube
Stuck? Start here: 6 faces, 12 edges, 8 vertices - this matches a cube OR cuboid.
This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.
Oisin is building a model house for his Design and Technology project. He needs to describe the box he is using as the base.
How many faces, edges, and vertices does a cuboid have?
cuboid properties
Step 1 of 6
Oisin is building a model house for his Design and Technology project. He needs to describe the box he is using as the base.
How many faces, edges, and vertices does a cuboid have?
A cuboid has 6 faces, 12 edges, and 8 vertices.
The key insight: Face, edge, vertex - think flat surface, line where they meet, corner point!
Watch out: A cuboid has 6 faces, 6 edges, and 6 vertices. Confusing edges with faces - there are more edges (12) than faces (6) on a cuboid.
These are the misconceptions we see most often in describe 3d shape properties, including the ones our practice questions are specifically designed to catch.
Struggling with describe 3d shape properties? The real gap is often in one of these earlier topics.
SEAGReady finds the exact step where your child gets stuck, teaches it with worked examples like the one above, and brings it back for review so it sticks.