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359 OF ENGINEERING FOBMULÆ.
Telegraph Construction, by Paget IIlGGS, LL.D.,
C.E.—continued.
Multipliers for regular polygons.
Diameter of circumscribing circle, the side being
= 1. Subtract unity from tabulated numbers for
outside diameters.
Areas of regular polygons,
S =* length of side. S2 X li = area.
No. of aides. k Log. No. of sides. * Log.
3 0-43301 V6364979 17 22-73549 1-3567043
4 1-OtiOUO o-ooooooo 18 25'52077 1-4068938
5 1 1-72018 0-2356496 IS 28*46519 1-4543141
6 2-59808 0-4146525 20 31’56876 1'4992575
1 1 3’63391 0'5610907 21 34-831 7 1-5419718
8 4'82843 0 6838057 22 38-25333 1-5826692
9 6’18182 0'7911164 23 41’83436 1-6215331
10 7-69421 08861641 2+ 45-57452 1-6587221
11 9-36564 0-9715374 25 49-47284 1-6943756
12 11-19615 1-0490687 26 53-53231 1-7286160
13 13-18577 1'1201055 27 57’74993 1-7615516
14 15'33450 !•1856696 28 62-12673 1-7932785
15 17-«4236 1-2465567 '29 66-66265 1-8238826
18 20-10936 1-3083083 30 71-35773 1-8534410