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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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