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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

Mathematics, Volume 1

United States. Bureau of Naval Personnel - Mathematics - 1951 - 280 pages
...millimeters (mm.) 1 nautical (sea) mile = ff statute (land) miles 2. SQUARE MEASURE OR MEASURES OF SURFACE 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet = 1 square yard (sq. yd.) 30.25 square yards = 1 square rod (sq. rd.) 160 square rods = 1 acre (A.) = 43,560 sq. ft. 640 acres...

National Bureau of Standards Circular, Issues 569-575

Weights and measures - 1956 - 288 pages
...formerly used in the United States was 6 080.20 feet=l nautical (geographical or sea) mile. AREA MEASURE' 144 square inches (sq in.) = 1 square foot (sq ft). 9 square feet = 1 square yard (sq yd) = 1 296 square inches. 30% square yards =1 square rod (sq rd) = 27214 square feet. 160 square rods...

Farm management

Robert R. Hudelson - Farm management - 1923 - 290 pages
...(yd.) 1 rod (rd.) 1 mile (mi.) 1 mile = 320 rods = 1,760 yd. = 5,280 ft. = 63,360 in. Square Measures 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet 30J^ square yards 160 square rods 640 acres 1 square mile 36 sections 43,560 square feet 1 square yard...

Metalwork and Enamelling: A Practical Treatise on Gold and Silversmiths ...

Herbert Maryon - Crafts & Hobbies - 1971 - 404 pages
...Millimetres into inches multiply by 0-03937 SURFACE MEASURES 1 square inch (sq. in. ) = 645-16 sq. mm. 144 square inches (sq. in.) = 1 square foot (sq. ft.). 9 square feet (sq. ft.) = 1 square yard (sq. yd.) 1 square centimetre (sq. cm.) = 0-15498 square inches. 1 iquare...

Airframe and Powerplant Mechanics: Powerplant Handbook

United States. Flight Standards Service - Airframes - 1976 - 568 pages
...centimeter, the square meter, et cetera, found in the metric system of measurement. TABLES OF AREAS 144 square inches (sq. in.) = 1 square foot (sq. ft.). 9 square feet = 1 square yard (sq. yd.). 30i square yards = 1 square rod (sq. rd.). 160 square rods = 1 acre (A). 640 acres = 1 square mile...