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Contributed by Yale Peabody Museum of Natural History.
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Transcription
General Equations and Useful Data
Symbol
Numerical
on Equation
Value
Area of circle....................
π d²
4
Area of Sector of Circle (Length of
arc = l).........................
1/2 lr
Area of Segment of Parabola (app.)
(c = chord; m = mid. ord.)......
2/3 cm
Area of Segment of Circle........
2/3 cm
Cubic Feet in 1 Cubic Meter.....
35.3145
Cubic Inches in 1 Imperial Gallon.
277.274
Cubic Inches in 1 U.S. Gallon....
231
Feet in 1 Meter...................
3.2808
Feet in 1 Mile....................
5280
Gallons (Imperial) in 1 Cubic Foot.
6.2321
Gallons (U.S.) in 1 Cubic Foot....
7.48
Miles in 1 Kilometer.............
0.6213
Pounds (Av.) in 1 Kilogram.......
π
2.2046
Ratio of Circumference to Diameter
3.14159
Reciprocal of π...................
0.31831
Square Feet in 1 Acre............
43,560
Volume of Sphere.................
4/3 πr³
Table I.—Minutes in Decimals of a Degree.
1′
.0167
11′
.1833
21′
.3500
31′
.5167
41′
.6833
51′
.8500
2
.0333
12
.2000
22
.3667
32
.5333
42
.7000
52
.8667
3
.0500
13
.2167
23
.3833
33
.5500
43
.7167
53
.8833
4
.0667
14
.2333
24
.4000
34
.5667
44
.7333
54
.9000
5
.0833
15
.2500
25
.4167
35
.5833
45
.7500
55
.9167
6
.1000
16
.2667
26
.4333
36
.6000
46
.7667
56
.9333
7
.1167
17
.2833
27
.4500
37
.6167
47
.7833
57
.9500
8
.1333
18
.3000
28
.4667
38
.6333
48
.8000
58
.9667
9
.1500
19
.3167
29
.4833
39
.6500
49
.8167
59
.9833
10
.1667
20
.3333
30
.5000
40
.6667
50
.8333
60
1 0000
Table II.—Inches in Decimals of a Foot.
⅛
3⁄₃₂
¼
⅝
½
5⁄₈
¾
7⁄₈
.0052
.0078
.0104
.0156
.0208
.0260
.0313
.0417
.0521
.0625
.0729
1
2
3
4
5
6
7
8
9
10
11
.0833
.1667
.2500
.3333
.4167
.5000
.5833
.6667
.7500
.8333
.9167
2