# Geometry

> Shapes, spaces, and spatial relations

- Skill: `ffsshhttiikk/geometry` (Agent Skill)
- Install (CLI): `npx skillmds@latest add ffsshhttiikk/geometry`
- Raw SKILL.md: https://api.skillmd.com/api/skills/ffsshhttiikk/geometry/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- License: MIT
- Author: ffsshhttiikk (https://skillmd.com/u/ffsshhttiikk)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/ffsshhttiikk/geometry

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## What I do
- Analyze Euclidean geometry and proofs
- Calculate areas and volumes of geometric shapes
- Apply trigonometric relationships
- Work with conic sections (ellipse, parabola, hyperbola)
- Use coordinate geometry and transformations
- Apply non-Euclidean geometry concepts

## When to use me
When solving spatial problems, geometric proofs, or coordinate system calculations.

## Key Concepts
- **Pythagorean Theorem**: a² + b² = c² for right triangles
- **Area Formulas**: Triangle = ½bh, Circle = πr², Sphere = 4πr²
- **Trigonometry**: sin²θ + cos²θ = 1, law of sines, law of cosines
- **Conic Sections**: Circle, ellipse, parabola, hyperbola from plane intersections
- **Transformations**: Translation, rotation, reflection, scaling
- **Vector Cross Product**: |a × b| = |a||b|sinθ gives area of parallelogram