Introduction to TrigonometryTrigonometric RatiosRight-angled TriangleSine (sin θ)Cosine (cos θ)Tange
Автор: Ravish Kumar1238
Загружено: 2026-01-18
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Introduction to Trigonometry
Trigonometry deals with the relationship between angles and sides of a right-angled triangle. It is widely used in mathematics, physics, and real-life problems.
Right-Angled Triangle
A triangle having one angle equal to 90°. Trigonometric ratios are defined only with respect to a right-angled triangle.
Trigonometric Ratios
These are ratios of sides of a right-angled triangle, used to find unknown sides and angles.
Sine (sin θ)
Ratio of the perpendicular side to the hypotenuse of a right-angled triangle.
Cosine (cos θ)
Ratio of the base side to the hypotenuse of a right-angled triangle.
Tangent (tan θ)
Ratio of the perpendicular side to the base of a right-angled triangle.
Cosecant (cosec θ)
Reciprocal of sine; ratio of hypotenuse to perpendicular.
Secant (sec θ)
Reciprocal of cosine; ratio of hypotenuse to base.
Cotangent (cot θ)
Reciprocal of tangent; ratio of base to perpendicular.
Reciprocal Trigonometric Ratios
Relationship between sin–cosec, cos–sec, and tan–cot.
Trigonometric Identities
Equations involving trigonometric ratios that are always true for all angles.
Standard Trigonometric Identities
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