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Mathematics for IGCSE & O level - Pythagoras' Theorem And Trigonometry (Section 4 - No. 35)

In a right-angled triangle, what is the relationship between the sides and angles that trigonometry describes?
The ratios of angles to side lengths.
The sum of all angles.
The area calculation.
The side lengths to each other.

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Trigonometry describes the relationship between the sides and angles.

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