78 
GEOGEAPHIC TABLES AND FORMULAS. 
[BULL. 214. 
Table 9. — Areas of quadrilaterals of earth's surface of 30 / extent in latitude and 
longitude — Continued . 
[From Smithsonian Geographical Tables.] 
Middle lati- 
tude of 
quadrilateral. 
Area in 
square miles. 
Middle lati- 
tude of 
quadrilateral. 
Area in 
square miles. 
Middle lati- 
tude of 
quadrilateral. 
Area in 
square miles. 
o 
/ 

/ 
o 
/ 
33 
00 
1,000.43 
44 
00 
860. 25 
55 
00 
687. 70 
33 
15 
997. 64 
44 
15 
856. 67 
55 
15 
683. 44 
33 
30 
994.83 
44 
30 
853. 07 
55 
30 
679. 17 
33 
45 
992.00 
44 
45 
849. 46 
55 
45 
674. 89 
34 
00 
989. 16 
45 
00 
845. 82 
56 
00 
670. 60 
34 
15 
986. 29 
45 
15 
842. 18 
56 
15 
666. 29 
34 
30 
983. 41 
45 
30 
838. 51 
56 
30 
661. 97 
34 
45 
980. 50 
45 
45 
834. 83 
56 
45 
657. 64 
35 
00 
977. 58 
46 
00 
831. 13 
57 
00 
653. 29 
35 
15 
974.64 
46 
15 
827. 42 
57 
15 
648. 93 
35 
30 
971. 68 
46 
.30 
823. 68 
57 
30 
644. 55 
35 
45 
968. 70 
46 
45 
819. 94 
57 
45 
640. 17 
36 
00 
965. 70 
47 
00 
816. 18 
58 
00 
635. 77 
36 
15 
962. 68 
47 
15 
812. 40 
58 
15 
631.36 
36 
30 
959. 65 
47 
30 
808. 60 
58 
30 
626. 93 
36 
45 
956. 60 
47 
45 
804. 79 
58 
45 
622. 49 
37 
00 
«>r>8. 52 
48 
00 
800. 97 
59 
00 
618. 05 
37 
15 
950. 43 
48 
15 
797.13 
59 
15 
613. 59 
37 
30 
947. 32 
48 
30 
793. 27 
59 
30 
609. 11 
37 
45 
944. 21 
48 
45 
789. 39 
59 
45 
604. 62 
38 
00 
941. 05 
49 
00 
785. 50 
60 
00 
600.13 
38 
15 
937. 88 
49 
15 
781. 60 
60 
15 
595. 62 
38 
30 
934. 71 
49 
30 
777.68 
60 
30 
591. 09 
38 
45 
931.51 
49 
45 
773. 74 
60 
45 
586. 56 
39 
00 
928. 29 
50 
00 
769. 79 
61 
00 
582. 01 
39 
15 
925. 06 
50 
15 
765. 83 
61 
15 
577. 45 
39 
30 
921. 80 
50 
30 
761.85 
61 
30 
572. 88 
39 
45 
918. 53 
50 
45 
757. 85 
61 
45 
568. 30 
40 
00 
915. 25 
51 
00 
753. 84 
62 
00 
563. 71 
40 
15 
911.94 
51 
15 
749. 82 
62 
15 
559.11 
40 
30 
908. 61 
51 
30 
745. 78 
62 
30 
554. 49 
40 
45 
905. 27 
51 
45 
741. 72 
62 
45 
549. 86 
41 
00 
901. 91 
52 
00 
737. 65 
63 
00 
545. 23 
41 
15 
898. 54 
52 
15 
733. 57 
63 
15 
540. 58 
41 
30 
895. 14 
52 
30 
729. 47 
63 
30 
535. 92 
41 
45 
891. 73 
52 
45 
725. 36 
63 
45 
531. 25 
42 
00 
888. 30 
53 
00 
721. 23 
64 
00 
526. 57 
42 
15 
884. 85 
53 
15 
717.08 
64 
15 
521 . 88 
42 
30 
881. 39 
53 
30 
712. 93 
64 
30 
517. 17 
42 
45 
877. 91 
53 
45 
708. 76 
64 
45 
512. 46 
43 
00 
874. 41 
54 
00 
704. 57 
65 
00 
507. 74 
43 
15 
870. 90 
54 
15 
700. 38 
65 
15 
503. 01 
43 
30 
867. 37 
54 
30 
696. 16 
65 
30 
498. 26 
43 
45 
863. 82 
54 
45 
691.94 
65 
45 
493. 51 
