Geometry and Measures
Line of Symmetry
Rotational Symmetry
Trigonometry
Pythagoras' Theorem and Applications
Trigonometry: Sine, Cosine, Tangent
Cosine Rule
Sine Rule
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Trigonometry: Sine, Cosine, Tangent
Geometry and Measures
Trigonometry: Sine, Cosine, Tangent
🎬 Video Tutorial
Basic Trigonometry:
Sine, cosine, and tangent depend only on angle θ in the right-angled triangle; they do not change with the size of the triangle.
Trigonometric Ratios:
sin θ = opposite/hypotenuse, cos θ = adjacent/hypotenuse, tan θ = opposite/adjacent.
Solving for Sides:
Use trigonometric ratios with a known angle and side to find missing triangle sides.
Finding Angles:
Find unknown angles θ using inverse functions like cos⁻¹ on a calculator.
Key Angle Values:
Memorise trigonometric values for common angles (30°, 45°, 60°) to simplify calculations.
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