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On a right-angled triangle, let one of the angles that is not the right angle be x. 'Sine x' is the length of the side opposite (not touching) x divided by the hypotenuse (longest side or the side that is opposite/not touching the right angle). This gives you the ratio or relationship between these two sides.

Sine-1 is the opposite; if you know the two sides (hypotenuse and opposite side) related to x, sine-1 of the opposite side divided by the hypotenuse will give you the size of angle x.

If this confuses you, sorry but it would have been much easier with a diagram. Wait until you learn trigonometry. There's only so much I can do using text.

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