Trigonometry at Key Stage 4

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The Sine Rule (Lengths) is used to find unknown lengths or angles in any triangle. It states that the ratio of the length of a side to the sine of its opposite angle is constant for all three sides and angles in a triangle.

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The Sine Rule (angles) is used to find unknown lengths or angles in any triangle. It states that the ratio of the length of a side to the sine of its opposite angle is constant for all three sides and angles in a triangle.

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The Cosine Rule is used to find a side or angle in a triangle when you know either two sides and the INCLUDED angle or three sides.

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The Area of a triangle, for non-right angled triangles.

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Sine is the trigonometric ratio of the Hypotenuse and opposite of an angle in a right angled triangle.

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Cosine is the trigonometric ratio of the Hypotenuse and Adjacent of an angle in a right angled triangle.

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Tangent is the trigonometric ratio of the Hypotenuse and Adjacent of an angle in a right angled triangle.

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Sin(0) =

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Sin (0) =0

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Cos(0) =

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Cos(0) =1

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Tan(0) =

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Tan(0) =0