| A | B |
|---|
| diagonal | a line drawn from one corner to another in a polygon |
| orientation | the way in which a figure is drawn |
| plane shape | a two-dimensional shape |
| polygon | a 2D shape that has only straight lines |
| symmetry | a balanced arrangement |
| bilateral symmetry | a property of a figure where one half is the mirror image of the other |
| axis of symmetry | a line that divides a figure into 2 parts that are mirror images of each other |
| rotational symmetry | a prperty of a figure where it can be spun about a point so that it repeats its shape more than once in a rotation |
| point symmetry | a point where the figure repeats itself after half a turn during a rotation |
| triangle | a plane shape that has 3 straight sides |
| scalene triangle | a triangle that has no equal sides |
| isosceles triangle | a triangle with 2 equal sides |
| equilateral triangle | a triangle with 3 equal sides |
| acute triangle | a triangle with all 3 angles less than 90 degrees |
| right triangle | a triangle with a 90 degree angle |
| obtuse triangle | a triangle with an obtuse angle |
| cross-section | the shape on the face where a solid has been sliced |
| prism | a solid that has 2 identical ends joined by rectangular faces |
| pyramid | a solid that has a base from which triangular faces rise to meet at a point |
| cylinder | a prism-like solid that has a circle for a cross-section |
| net of a solid | a 2D drawing of the surfaces of a solid that can be folded to make a solid |
| isometric projection | a way of drawing 3D pictures using isometric grid paper |
| polyhedra | 3D figures whose faces are plane shapes with straight edges |
| Platonic solids | regular polyhedra |
