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The ratio of the constituents of a mixture cannot be determined.
Lift/Drag x Height loss
To find the perimeter of polygon efgh, you need the ratio of similarity between polygons abcd and efgh, as well as the perimeter of polygon abcd. Once you have the perimeter of abcd, multiply it by the ratio to obtain the perimeter of efgh. If the ratio is not provided, it cannot be determined.
The profit or loss would depend on the number of units produced and the number sold. These numbers need not be equal. There is, therefore, not enough information to provide a sensible answer.
Archimedes determined that pi was between 31/7 = 3.1429 and 310/71 = 3.1408. To four decimal places, the true value is 3.1416