2D and 3D shapes
MathGrades 1–424 clues and answers
Flat shapes, solid shapes and the words for their parts: twenty-four clues from triangle and hexagon to cylinder, edge, vertex and line of symmetry. The clues use everyday comparisons (a stop sign, a can, an ice-cream cone) so younger students can picture each shape before they name it.
Games with this list
The list
| Clue | Answer | |
|---|---|---|
| 1 | A flat shape with 3 sides | Triangle |
| 2 | 4 equal sides and 4 square corners | Square |
| 3 | 4 square corners, two long sides and two short sides | Rectangle |
| 4 | A round flat shape with no corners | Circle |
| 5 | A flat shape like a stretched circle or an egg | Oval |
| 6 | A flat shape with 5 sides | Pentagon |
| 7 | A flat shape with 6 sides, like a honeycomb cell | Hexagon |
| 8 | A flat shape with 8 sides, like a stop sign | Octagon |
| 9 | A flat shape with 7 sides | Heptagon |
| 10 | A flat shape with 10 sides | Decagon |
| 11 | 4 sides with just one pair of parallel sides | Trapezoid |
| 12 | 4 equal sides but no square corners | Rhombus |
| 13 | 4 sides in two parallel pairs that lean over | Parallelogram |
| 14 | A solid shape like a ball | Sphere |
| 15 | A solid shape with 6 square faces, like a die | Cube |
| 16 | A solid shape like a can of soup | Cylinder |
| 17 | A solid shape like an ice-cream cone | Cone |
| 18 | A solid with a square base and triangle sides that meet at a point | Pyramid |
| 19 | A solid like a shoebox, with rectangle faces | Rectangular prism |
| 20 | A flat surface of a solid shape | Face |
| 21 | Where two faces of a solid shape meet | Edge |
| 22 | A corner where edges meet | Vertex |
| 23 | A line that splits a shape into two mirror halves | Line of symmetry |
| 24 | A square corner of exactly 90 degrees | Right angle |