# Maths for Year 9

> Maths for Year 9 in England: Congruent triangles and triangle facts, Similar triangles, Pythagoras' theorem and more. Explanations, games and free practice.

The Year 9 topics, in the order they are usually taught.

- [Congruent triangles and triangle facts](https://kixplo.com/uk/en/maths/year-9/congruent-triangles.md)
- [Similar triangles](https://kixplo.com/uk/en/maths/year-9/similar-triangles.md)
- [Pythagoras' theorem](https://kixplo.com/uk/en/maths/year-9/pythagoras.md)
- [Probability](https://kixplo.com/uk/en/maths/year-9/probability.md)
- [Relative frequency](https://kixplo.com/uk/en/maths/year-8/frequency-and-charts.md)
- [Expanding brackets and factorising](https://kixplo.com/uk/en/maths/year-9/expanding-brackets.md)
- [Functions](https://kixplo.com/uk/en/maths/year-7/reading-graphs.md)
- [Reading values from a line graph](https://kixplo.com/uk/en/maths/year-8/averages-and-range.md)
- [Simultaneous equations on a graph](https://kixplo.com/uk/en/maths/year-9/simultaneous-equations-on-a-graph.md)
- [Kites: diagonals and coordinates](https://kixplo.com/uk/en/maths/year-8/angles-in-a-kite.md)
- [Isosceles triangles: the converse theorems](https://kixplo.com/uk/en/maths/year-9/isosceles-triangles.md)
- [Sides and angles in a triangle](https://kixplo.com/uk/en/maths/year-9/sides-and-angles-in-a-triangle.md)
- [Area and perimeter of a trapezium](https://kixplo.com/uk/en/maths/year-8/parallel-lines-and-trapezia.md)
- [Is it a parallelogram?](https://kixplo.com/uk/en/maths/year-8/parallelogram-angles-sides.md)
- [Rectangles, rhombuses and squares](https://kixplo.com/uk/en/maths/year-8/which-quadrilateral.md)
- [Events in two stages and the area model](https://kixplo.com/uk/en/maths/year-9/two-stage-events.md)
- [Reading a function from its graph](https://kixplo.com/uk/en/maths/year-9/function-graphs.md)

[Practise on the site](https://kixplo.com/uk/en/)