NCERT CLASS 10 MATHS • CHAPTER 8

Introduction to Trigonometry (त्रिकोणमिति)

Master Right-Angled Triangles, Ratios (0°–90°), & Identities with Instant Solutions

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1. Trigonometric Ratios
sin A = opp/hyp
cos A = adj/hyp
tan A = opp/adj = sin A / cos A
2. Master Identities
sin²A + cos²A = 1
1 + tan²A = sec²A
1 + cot²A = cosec²A
3. Key Angle Values
sin 30° = 1/2, sin 45° = 1/√2
cos 30° = √3/2, cos 45° = 1/√2
tan 45° = 1, tan 60° = √3