Year 2 · 2-D and 3-D shapes · Summary

Year 2 2-D and 3-D shapes: summary and key words

Part of the Year 2 2-d and 3-d shapes chapter. Chapter overview · whole chapter on one page

Chapter summary

Skill	Method
2-D shapes	A flat shape has length and width. A side is a straight edge. A corner is a sharp point.
Sides	Triangle 3, square 4, rectangle 4, pentagon 5, hexagon 6. A circle or an oval has no straight sides.
Vertical line of symmetry	The two halves match when folded along a straight up-and-down line.
3-D shapes	A face is flat. An edge is a straight line where faces meet. A vertex is a corner.
Cube and cuboid	Each has 6 faces, 12 edges and 8 vertices.
2-D shapes on 3-D shapes	A cube has square faces. A cuboid has rectangle faces. A cylinder has circle ends.
Sorting	Sort shapes by flat or solid, by sides, or by curved surfaces. A ball is a sphere; a tin is a cylinder.

2-D shape: a flat shape with length and width, but no depth.
3-D shape: a solid shape with length, width and depth.
side: a straight edge of a flat shape.
corner: a sharp point where two sides of a flat shape meet.
line of symmetry: a line where a shape folds so that the two halves match.
vertical: straight up and down.
face: a flat surface of a solid shape.
edge: a straight line where two faces of a solid shape meet.
vertex: a corner of a solid shape. More than one is vertices.
cube: a solid shape with 6 equal square faces.
cuboid: a solid box shape with 6 rectangle faces.
sphere: a round solid shape, like a ball, with no flat faces.
cylinder: a solid shape with 2 flat circle ends and a curved side.
cone: a solid shape with a round flat base and one point at the top.
pyramid: a solid shape with a flat base and triangle faces that meet at a point.