# Maths - Regions

> Source: https://ollybritton.com/notes/a-level/maths/topics/regions/ · Updated: 2020-11-11 · Tags: year-1, school, maths

##### Why is it better to shade what you DON'T want when finding a region??
Because the bit you want will be clear at the end.

##### When is a vertex of a region included??
If both intersecting lines are included by the region.

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