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weights and measures.

 square measure. 144 square inches (sq. in.) = 1 square foot sq. ft 9 square feet = 1 square yard sq. yd. 30¼ square yards = 1 square rod sq. rd. 160 square rods = 1 acre A. 640 square acres = 1 square mile sq. mi.
 sq. mi. A. sq. rd. sq. yd. sq. ft. sq. in. 1 = 640 = 102,400 = 3,097,600 = 27,878,400 = 4,014,489,600
surveyor's square measure.
 625 square links (sq. li.) = 1 square rod sq. rd. 16 square rods = 1 square chain sq. ch. 10 square chains = 1 acre A. 640 acres = 1 square mile sq. mi. 36 square miles = 1 township Tp.
1 sq. mi. = 640 A. = 6,400 sq. ch. = 102,400 sq. rd. = 64,000,000 sq. li.
The acre contains 4,840 sq. yd., or 43,560 sq. ft., and is equal to the area of a square measuring 208.71 ft. on a side.
cubic measure.
 1,728 cubic inches (cu. in.) = 1 cubic foot cu. ft. 27 cubic feet = 1 cubic yard cu. yd. 128 cubic feet = 1 cord cd. 24¾ cubic feet = 1 perch P. 1 cu. yd. = 27 cu. ft. = 46,656 cu. in.
measure of angles or arcs.
 60 seconds (") = 1 minute ' 60 minutes = 1 degree ° 90 degrees = rt. angle or quadrant □ 360 degrees = circle cir.
1 cir. = 360° = 21,600' = 1,296,000"

useful tables
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