·
The
circumference of a circle is the diameter x 3.1416.
·
The
diameter of a circle is the circumference multiplied by .31831.
·
The
area of a circle is the diameter x itself x .7854.
·
The
area of an oval is the longest diameter x the shortest x .7854.
·
A
circle is .7854 times as heavy as a square of the same size, i.e., the loss in
cutting a circle from a square is .2146 of the weight of the square.
TABLE
Circles and Squares
(Circumferences and Areas)
|
|
Circum- |
Area in |
Area in |
|
|
Circum- |
Area in |
Area in |
|
Size in |
ference |
Square |
Square |
|
Size in |
ference |
Square |
Square |
|
inches |
in Inches |
inches |
Inches |
|
inches |
in Inches |
inches |
inches |
|
1/4 |
.7854 |
.0491 |
.0625 |
|
10 1/4 |
32.20 |
82.52 |
105.06 |
|
1/2 |
1.571 |
.1964 |
.2500 |
|
10 1/2 |
32.99 |
86.59 |
110.25 |
|
3/4 |
2.356 |
.4418 |
.5625 |
|
10 3/4 |
33.77 |
90.76 |
115.56 |
|
1 |
3.142 |
.7854 |
1.000 |
|
11 |
34.56 |
95.03 |
121.00 |
|
1 1/4 |
3.927 |
1.227 |
1.563 |
|
11 1/4 |
35.34 |
99.40 |
126.56 |
|
1 1/2 |
4.712 |
1.767 |
2.250 |
|
11 1/2 |
36.13 |
103.87 |
132.25 |
|
1 3/4 |
5.498 |
2.405 |
3.063 |
|
11 3/4 |
36.91 |
108.43 |
138.06 |
|
2 |
6.283 |
3.142 |
4.000 |
|
12 |
37.70 |
113.10 |
144.00 |
|
2 1/4 |
7.069 |
3.976 |
5.063 |
|
12 1/4 |
38.48 |
117.86 |
150.06 |
|
2 1/2 |
7.854 |
4.909 |
6.250 |
|
12 1/2 |
39.27 |
122.72 |
156.25 |
|
2 3/4 |
8.639 |
5.940 |
7.563 |
|
12 3/4 |
40.06 |
127.68 |
162.56 |
|
3 |
9.425 |
7.069 |
9.000 |
|
13 |
40.84 |
132.73 |
169.00 |
|
3 1/4 |
10.21 |
8.296 |
10.56 |
|
13 1/4 |
41.63 |
137.89 |
175.56 |
|
3 1/2 |
11.00 |
9.621 |
12.25 |
|
13 1/2 |
42.41 |
143.14 |
182.25 |
|
3 3/4 |
11.78 |
11.04 |
14.06 |
|
13 3/4 |
43.20 |
148.49 |
189.06 |
|
4 |
12.57 |
12.57 |
16.00 |
|
14 |
43.98 |
153.94 |
196.00 |
|
4 1/4 |
13.35 |
14.19 |
18.06 |
|
141/4 |
44.77 |
159.49 |
203.06 |
|
4 1/2 |
14.14 |
15.90 |
20.25 |
|
14 1/2 |
45.55 |
165.13 |
210.25 |
|
4 3/4 |
14.92 |
17.72 |
22.56 |
|
14 3/4 |
46.34 |
170.87 |
217.56 |
|
5 |
15.71 |
19.64 |
25.00 |
|
15 |
47.12 |
176.72 |
225.00 |
|
5 1/4 |
16.49 |
21.65 |
27.56 |
|
15 1/4 |
47.91 |
182.65 |
232.56 |
|
5 1/2 |
17.28 |
23.76 |
30.25 |
|
15 1/2 |
48.69 |
188.69 |
240.25 |
|
5 3/4 |
18.06 |
25.97 |
33.06 |
|
15 3/4 |
49.48 |
194.83 |
248.06 |
|
6 |
18.85 |
28.27 |
36.00 |
|
16 |
50.27 |
201.06 |
256.00 |
|
6 1/4 |
19.64 |
30.68 |
39.06 |
|
16 1/4 |
51.05 |
207.39 |
264.06 |
|
6 1/2 |
20.42 |
33.18 |
42.25 |
|
16 1/2 |
51.84 |
213.83 |
272.25 |
|
6 3/4 |
21.21 |
35.78 |
45.56 |
|
16 1/4 |
52.62 |
220.35 |
280.56 |
|
7 |
21.99 |
38.48 |
49.00 |
|
17 |
53.41 |
226.98 |
289.00 |
|
7 1/4 |
22.78 |
41.28 |
52.56 |
|
17 1/4 |
54.19 |
233.71 |
297.56 |
|
7 1/2 |
23.56 |
44.18 |
56.25 |
|
17 1/2 |
54.98 |
240.53 |
306.25 |
|
7 3/4 |
24.35 |
47.17 |
60.06 |
|
17 3/4 |
55.76 |
247.45 |
315.06 |
|
8 |
25.13 |
50.27 |
64.00 |
|
18 |
56.55 |
254.47 |
324.00 |
|
8 1/4 |
25.92 |
53.46 |
68.06 |
|
18 1/4 |
57.33 |
261.59 |
333.06 |
|
8 1/2 |
26.70 |
56.75 |
72.25 |
|
18 1/2 |
58.12 |
268.80 |
342.25 |
|
8 1/4 |
27.49 |
60.13 |
76.56 |
|
18 3/4 |
58.91 |
276.12 |
351.56 |
|
9 |
28.28 |
63.62 |
81.00 |
|
19 |
59.69 |
283.53 |
361.00 |
|
9 1/4 |
29.06 |
67.20 |
85.56 |
|
19 1/4 |
60.48 |
291.04 |
370.56 |
|
9 1/2 |
29.85 |
70.88 |
90.25 |
|
19 1/2 |
61.26 |
298.65 |
380.25 |
|
9 3/4 |
30.63 |
74.66 |
95.06 |
|
19 3/4 |
62.05 |
306.36 |
390.06 |
|
10 |
31.42 |
78.54 |
100.00 |
|
20 |
62.83 |
314.16 |
400.00 |