Size

Area

1/8

0.0123

1/4

0.0491

3/8

0.1104

1/2

0.1963

5/8

0.3067

3/4

0.4417

7/8

0.6013

1

0.7854

1/8

0.9940

1/4

1.227

3/8

1.484

1/2

1.767

5/8

2.073

3/4

2.405

7/8

2.761

2

3.141

1/4

3.976

1/2

4.908

3/4

5.939

3

7.068

1/4

8.295

1/2

9.621

3/4

11.044

4

12.566

1/2

15.904

5

19.635

1/2

23.758

6

28.274

1/2

33.183

7

38.484

1/2

44.178

8

50.265

1/2

56.745

9

63.617

1/2

70.882

Size

Area

10

78.54

1/2

86.59

11

95.03

1/2

103.86

12

113.09

1/2

122.71

13

132.73

1/2

143.13

14

153.93

1/2

165.13

15

176.71

1/2

188.69

16

201.06

1/2

213.82

17

226.98

1/2

240.52

18

254.46

1/2

268.80

19

283.52

1/2

298.64

20

314.16

1/2

330.06

21

346.36

1/2

363.05

22

380.13

1/2

397.60

23

415.47

1/2

433.73

24

452.39

1/2

471.43

25

490.87

26

530.93

27

572.55

28

615.75

29

660.52

Size

Area

30

706.86

31

754.76

32

804.24

33

855.30

34

907.92

35

962.11

36

1017.8

37

1075.2

38

1134.1

39

1194.5

40

1256.6

41

1320.2

42

1385.4

43

1452.2

44

1520.5

45

1590.4

46

1661.9

47

1734.9

48

1809.5

49

1885.7

50

1963.5

51

2042.8

52

2123.7

53

2206.1

54

2290 2

55

2375.8

56

2463.0

57

2551.7

58

2642.0

59

2733.9

60

2827.4

61

2922.4

62

3019.0

63

3117.2

64

3216.9

Size

Area

65

3318.3

66

3421.2

67

3525.6

68

3631.6

69

3739.2

70

3848.4

71

3959.2

72

4071.5

73

4185.3

74

4300.8

75

4417.8

76

4536.4

77

4656 0

78

4778.3

79

4901.6

80

5026.5

81

5153.0

82

5281.0

83

5410.6

84

5541.7

85

5674.5

86

5808.8

87

5944.6

88

6082.1

89

6221.1

90

6361.7

91

6503 8

92

6647.6

93

6792.9

94

6939.7

95

7088.2

96

7238.2

97

7389*8

98

7542.9

99

7697.7

To find the circumference of a circle when diameter is given, multiply the given diameter by 3.1416.

To find the diameter of a circle when circumference is given, multiply the given cir cumference by .31831.

the two axes and multiply the square root of half their sum by 3.1416.