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Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 4 - No. 29)

What is the purpose of using trigonometric ratios (sine, cosine, tangent)?
To find the area of a triangle
To relate the angles of a right triangle to the lengths of its sides
To find the perimeter of a triangle
To measure the volume of a 3D shape

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Trigonometric ratios are used to relate the angles of a right triangle to its side lengths.

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