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A meter stick lies on the bottom of a 100-cm-long tank with its zero mark against the left edge.

A meter stick lies on the bottom of a 100-cm-long tank with its zero mark against the left edge. You look into the tank at a 30 angle, with your line of sight just grazing the upper left edge of the tank. What mark do you see on the meter stick the tank is (a) empty, (b) half full of water, and (c) completely full of water?

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