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📐 Trigonometry
Trigonometry — SOH CAH TOA
Study of triangles and angles; sin, cos, tan ratios; essential for physics, engineering and navigation
Greece/India 🌍 150 BC Trigonometry
Key Facts
- 1
SOH CAH TOA: sin=opposite/hypotenuse, cos=adjacent/hypotenuse, tan=opposite/adjacent
- 2
Key identities: sin²θ+cos²θ=1; sin2θ=2sinθcosθ; values at 0°, 30°, 45°, 60°, 90° are standard
- 3
Applications: architecture (slopes), navigation (angles), physics (waves), astronomy (distances to stars)
🔢 Did you know? Aryabhata's sine table (499 AD) was the most accurate for 1,000 years — Indian mathematics gave trigonometry its modern form via Islamic scholars to Europe
Quick Reference
Category
Trigonometry
Country
🌍 Greece/India
Year / Era
150 BC
About
Study of triangles and angles