Service Forester's Handbook

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====== Area of Circles & Surveying Corrections ======
===== Area of Circles and Square Feet Equivalents =====
^ Area in Acres ^ Square Dimension ^^ Radius of Circle         ^^^
^               ^ Feet     ^ Meters ^ Feet     ^ Meters ^ Chains ^
| 1 \ 1,000     | 6'7.2"   | 2.1    | 3'8.7"   | 1.14   | 0.056  |
| 1 \ 100       | 20'10.5" | 6.36   | 11'9.3"  | 3.59   | 0.18   |
| 1 \ 20        | 46'8.0"  | 14.2   | 26'4.0"  | 8.03   | 0.40   |
| 1 \ 10        | 66'0"    | 20.1   | 37'2.8"  | 11.35  | 0.56   |
| 1 \ 5         | 93'4.1"  | 28.5   | 52'7.9"  | 16.05  | 0.80   |
| 1 \ 4         | 104'4.3" | 31.8   | 58'10.5" | 17.95  | 0.89   |
| 1             | 208'8.5" | 63.6   | 117'9.0" | 35.89  | 1.78   |

===== Surveying Corrections =====
^ Difference in Bearing or Elevation for a Distance of One Mile ^^^^
^ Angle ^ Difference (Feet) ^ Angle ^ Difference (Feet)            ^
| 1°    | 92.16             | 8°    | 742.06                       |
| 2°    | 184.38            | 9°    | 836.27                       |
| 3°    | 276.71            | 10°   | 931.01                       |
| 4°    | 369.21            | 11°   | 1026.33                      |
| 5°    | 461.94            | 12°   | 1122.30                      |
| 6°    | 554.95            | 13°   | 1218.98                      |
| 7°    | 648.30            | 14°   | 1316.45                      |

NOTE: One minute of angle makes a difference of 1.536 feetper mile.

Service Forester's Handbook

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