I will update this notebook at least once per month, with formulae, techniques and proofs.

这篇笔记每月至少会更新一次，内容包括公式，证明，解题技巧。

- Geometric measuring 几何度量

- 1.1 2D shapes 二维图形

1.1.1 area 面积

1.1.2 perimeter 周界 - 1.2 3D shapes 三维立体

1.2.1 volume 体积

1.2.2 surface area 表面积

- 1.1 2D shapes 二维图形
- Trigonometry 三角学
- 2.1 trigonometric functions 三角函数

2.1.1 definition and special values 定义和特殊值

2.1.2 trigonometric identities 三角学定律 - 2.2 the centres of a triangle 三角形的“心”

- 2.1 trigonometric functions 三角函数
- Parallel & perpendicular & lines & angles 平行，垂直，线，角

- 3.1 2D 二维

3.1.1 parallel 平行

- 3.1 2D 二维
- Cartesian coordinate geometry 解析几何

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Easy Math Editor

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