What are used to find height or length of an object or distance between two distant objects.

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answer is A.

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Detailed Solution

We need to find out of the given options, what is used to find height or length of an object or distance between two distant objects.
Height or length of an object or distance between two distant objects can be determined is the angle of elevation or depression of such objects are known.
If the angle of elevation or depression of the top or bottom or any other points of an object are known, then the height of length of such objects can be determined using trigonometric ratios. Trigonometric ratios can also be used to determine the distance between two objects.
Thus, trigonometric ratios are used to find the height or length of objects or the distance between two distinct objects.
Therefore, option 1 is correct.

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