Trigonometry
A branch of mathematics studying relationships between side lengths and angles of triangles, essential for astronomy, surveying, and navigation.
Core metadata
- ID: trigonometry
- Era: Classical
- First known date: -150 (century)
- Region: Hellenistic Greek astronomy (Hipparchus and successors)
- Review status: source_checked
- Maturity: N/A
Prerequisites
- Basic Algebra (algebra_basic)
- Early Astronomical Observation (early_astronomy_observation)
- Geometry (geometry)
Dependents
Fields
- None.
Node sources
- Trigonometry table (Encyclopaedia Britannica, 2026, textbook) • Supports: node
Locator: Britannica identifies Hipparchus as the first to compose a table of trigonometric functions based on chords in a circle; this pins classical trigonometry to Hellenistic astronomy before his death circa 127 BCE.
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 3
- Average edge confidence: 73%
- Prerequisite sources: 2
- expert_inference: 3
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Geometry (geometry) | enabling | 68% | expert_inference | Geometry provides a capability that enables this technology without being the only possible path. |
|
| Basic Algebra (algebra_basic) | historical_predecessor | 75% | expert_inference | Basic Algebra is an earlier historical predecessor or foundation, not a one-to-one engineering dependency. | No sources recorded. |
| Early Astronomical Observation (early_astronomy_observation) | historical_predecessor | 75% | expert_inference | Early Astronomical Observation is an earlier historical predecessor or foundation, not a one-to-one engineering dependency. |
|
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