02: Glass half full? [*]

I have two cylindrical glasses that, when full, hold the same amount of water. The short glass has a radius that is half again as large as the tall one’s. Last night, I filled the short one completely, and then I filled the tall one to exactly the same level.
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How full was the tall glass? (You can answer as a fraction or a percentage.)
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Spiciness: * out of ****