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by eesmith
1252 days ago
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It looks like a rounding difference in the display. The exact answer is 1124.5, which when rounded up to 4 significant digits is 1125 sq inch. 7.809 sq ft is the correct answer in sq ft, again, rounded to 4 significant digits. >>> (1*12 + 1 ) * (7*12 + 2.5)
1124.5
>>> ((1*12 + 1 ) * (7*12 + 2.5) ) / (12 * 12)
7.809027777777778
This is the decimal display of the closest float64 value to the exact rational answer of 2249/288 sq. ft (7 and 233/288 sq. ft., or 7 sq. ft. and 116.5 sq. inches). |
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