Geometry
9 problems · 6 with full explanations
0 Easy4 Medium1 Hard
Geometry problems involve coordinates, lines, circles, and polygons. Key tools: cross product (orientation, area), dot product (angle), Graham scan (convex hull), and line intersection. Use long arithmetic to avoid floating-point errors when possible.
How to practice
To practice Geometry problems effectively, start with the Easy problems listed below, trace through each solution on paper, then re-implement without looking. When you can recognise the geometry pattern within 30 seconds of reading a new problem, move on to Medium difficulty. Use the related topic pages and our study guide for a structured progression.
All Geometry problems
- 593.Valid SquareMedium
- 812.Largest Triangle AreaHard
- 892.Surface Area of 3D ShapesMedium
- 973.K Closest Points to OriginMedium
- 976.Largest Perimeter TriangleMedium
- 3025.Find the Number of Ways to Place People IUnknown
- 3027.Find the Number of Ways to Place People IIUnknown
- 3623.Count Number of Trapezoids IUnknown
- 3625.Count Number of Trapezoids IIUnknown