Square Measure 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet = 1 square yard (sq. yd.) 30£ square yards = 1 square rod (sq. rd.) 160 square rods = 1 acre (A.) 640 acres = 1 square mile (sq. A Grammar Shcool Arithmetic - Page 174 by George Albert Wentworth - 1886 - 372 pages Full view -
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