📚 KS3 Maths: Formula Summary Handbook | KS3 数学：公式汇总手册
This handbook provides a quick reference to essential formulas covered in KS3 Mathematics. Understanding these formulas and when to apply them will help you solve problems confidently across topics including geometry, algebra, statistics, and more.
本手册提供 KS3 数学核心公式的快速参考。理解这些公式及其应用场景，将帮助你自信地解答几何、代数、统计等各类题目。
1. Area and Perimeter | 面积与周长
The area of a rectangle is found by multiplying length and width. The perimeter is the sum of all sides.
A = l × w P = 2(l + w)
矩形的面积等于长乘以宽。周长是所有边长的总和。
For a triangle, area is half the base times the height. Add the three sides for perimeter.
A = ½ b h P = a + b + c
三角形面积等于底乘高的一半。周长等于三边之和。
A parallelogram’s area is base × perpendicular height (not the slant side).
A = b × h
平行四边形的面积等于底乘垂直高。
The area of a trapezium (
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