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For Edexcel GCSE Mathematics, you need to know the properties of triangles, quadrilaterals and circles in detail. This means knowing not just the names, but the exact properties of sides, angles, diagonals and symmetry. This lesson provides a comprehensive reference and worked examples.
| Term | Meaning |
|---|---|
| Diagonal | A line joining two non-adjacent vertices of a polygon |
| Line of symmetry | A line that divides a shape into two mirror-image halves |
| Rotational symmetry | The shape looks the same after a rotation of less than 360°; the order tells you how many times |
| Perpendicular | At right angles (90°) to each other |
| Bisect | To cut exactly in half |
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