9 feet = 9*0.3048 metres = 2.7432 m
So 9 ft * 9 ft = 2.7432 * 2.7432 m2 = 7.53 m2approx.
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9'10" * 30' = 910/12 * 30 = 295 square feet
4,7,10 inches is not a right triangle. The others are because they obey Pythagorean theorem and are 3,4,5 right triangles - the hypotenuse is the square root of the sum of the others sides squared
718 square feet = about 66.7 square meters. (66.7043827 square meters)
About 0.84 square meters (0.83612736 square meters)
24 square meters