Puzzle | Cylindrical Glass and Water Measurement

Suppose you are in an empty closed room with a glass of water without using any measuring tool how will you identify whether the water in the glass is half-filled or less than half-filled or more than half-filled?

Hold the glass incline such that the water is just about to spill and observe the water level if water goes below the apparent corner of the bottom of the glass then it’s less than half-filled, or if the water level is above this point then it’s more than half-filled, else the water is half-filled.

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