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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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