TRG002 · Trigonometry · Classes 10–12
Trigonometry
Relations between angles and sides of triangles, extended to any angle with the unit circle.
Unit circle and trigonometry
📐 Formula
sin θ = opp/hyp, cos θ = adj/hyp, tan θ = opp/adj; sin²θ + cos²θ = 1
✏️ Worked example
θ = 30°: sin = 0.5, cos ≈ 0.866, tan ≈ 0.577.
🌍 Where it is used
Heights of buildings, navigation and waves.
❓ Quick check
sin 90° =