All Topics
Geometry
Polygons: Angles, Perimeter & Area
多边形：角度、周长与面积
High frequency
Exam Frequency
11
avg per test
6
Quantitative Reasoning
5
Math Achievement
What to Study
- Rectangles (A = lw)
- Parallelograms (A = bh)
- Trapezoids (A = ½h(b₁+b₂))
- Regular polygons
- Interior angle sum = (n-2) × 180°
- Composite figures
- Perimeter calculations
Key Formulas
Rectangle: A = lw, P = 2l + 2w
Parallelogram: A = bh
Trapezoid: A = ½h(b₁ + b₂)
Interior angle sum = (n-2) × 180°
Each angle of regular polygon = (n-2) × 180° / n