10 MISC. PUBLICATION 225, U. S. DEPT. OF AGKICULTUBE 



Table 18. — Basal area in square feet from given diameters of 0.1 to 60 inches 1 



Diameter, 

 inches 



Area of 

 circle 



Diameter, 



inches 



Area of 

 circle 



Diameter, 



inches 



Area of 

 circle 



Diameter, 



inches 



Area of 

 circle 



0.1 



Sq.ft. 

 0.0001 



.0002 



.0005- 



.0009 



.0014 



.0020 



.0027 



. 0035- 



.0044 



. 0055- 



.0066 



.0079 



.0092 



.0107 



.0123 



.0140 



.0158 



.0177 



. 0197 



.0218 



.0241 



.0264 



.0289 



.0314 



.0341 



.0369 



.0398 



.0428 



. 0459 



.0491 



.0524 



.0559 



.0594 



.0631 



.0668 



.0707 



.0747 



.0788 



.0830 



.0873 



.0917 



.0962 



.1008 



.1056 



.1104 



.1154 



. 1205- 



.1257 



.1310 



.1364 



.1419 



. 1475— 



.1532 



.1590 



.1650 



.1710 



. 1772 



. 1835- 



.1899 



.1963 



.2029 



.2097 



.2165- 



.2234 



.2304 



.2376 



.2448 



.2522 



.2597 



.2673 



.2749 



.2827 



.2907 



.2987 



.3068 



. 3150 • 



.3234 



.3318 



i 

 7.9 



Sq.ft. 



0. 3404 

 .3491 

 .3578 

 .3667 

 .3757 

 .3848 

 .3941 

 .4034 

 .4128 

 .4224 

 .4320 

 .4418 

 .4517 

 .4616 

 .4717 

 .4819 

 .4922 

 .5027 

 .5132 

 .5238 

 .5346 

 .5454 

 .5564 



. 5675- 

 .5^86 

 .5899 

 .6013 

 .6128 

 .6244 

 .6362 

 .6480 

 .6600 

 .6^20 

 .6842 

 .6964 

 .70>S 

 .7213 

 .7339 

 .7466 

 . 7594 

 .7724 

 .7854 

 .7985+ 

 .8118 

 .8252 

 .8386 

 .8522 

 .8659 

 .8797 

 .8936 

 .9076 

 .9218 

 .9360 

 .9503 

 .9648 

 . 9793 

 .9940 

 1.0088 



1. 0237 

 1. 0387 

 1. 0538 

 1.0690 

 1. 0843 

 1. 099S 

 1. 1153 

 1. 1310 

 1. 1467 

 1. 1626 

 1. 1786 

 1. 1947 

 1.2109 

 1.2272 

 1. 2436 

 1. 2601 

 1. 2768 

 1. 2935+ 

 1.3104 

 1. 3273 



15.7 



Sq.ft. 

 1.3444 

 1. 3616 

 1. 3789 

 1. 3963 

 1. 4138 

 1. 4314 

 1.4491 

 1. 4669 

 1.4849 

 1. 5029 

 1. 5211 

 1. 5394 

 1. 5578 

 1. 5763 

 1. 5948 

 1. 6136 

 1. 6324 

 1. 6513 

 1. 6703 

 1. 6895- 

 1. 70S7 

 1. 7281 

 1. 7476 

 1. 7671 

 1. 7868 

 1. 8066 

 1. 8265+ 

 1.8466 

 1. 8667 

 1.8869 

 1. 90"3 

 1.9277 

 1. 9483 

 1. 9689 



1. 9897 



2. 0106 

 2.0316 

 2. 0527 

 2. 0-39 

 2. 0953 

 2. 1167 

 2. 1382 

 2. 1599 

 2. 1817 

 2. 2035+ 

 2. 2255+ 

 2. 2476 

 2. 2698 

 2. 2921 

 2. 3145+ 

 2. 3371 

 2. 3597 

 2. 3824 

 2. 4053 

 2. 4282 

 2. 4513 

 2.4745- 

 2. 4978 

 2. 5212 

 2. 5447 

 2. 5683 

 2. 5920 

 2. 6159 

 2. 6398 

 2. 6639 

 2.68S0 

 2. 7123 

 2. 7367 

 2. 7612 

 2. 7858 

 2.S105- 

 2. 8353 

 2. 8602 

 2. 8852 

 2.9104 

 2. 9356 

 2. 9610 

 2. 9865- 



1 



23.5 



Sq.ft. 

 3 0121 



0.2 



8 



15.8 



23.6 



3 0377 



0.3 



8.1 



15.9. 



23.7 



3. 0635+ 

 3. 0895- 

 3 1155 



0.4. 



8.2 



16 



23.8 



0.5 



8.3 



16.1. 



23.9. - 



0.6 -. 



8.4 



16.2 



24- - 



3 1416 



0.7 



8.5 - - - 



16.3. — 



24.1 



3. 1678 

 3 1942 



0.8 



8.6 



16.4- . 



24.2. 



0.9 



8.7 



16.5 



24.3. 



3 2206 



1 -- 



8.8 



16.6 



24.4 



3. 2472 

 3. 2739 

 3 3006 



1.1 



8.9 



16.7 



24.5 



1.2 



9 - 



16.8 



24.6- 



1.3. 



9.1 



16.9 



24.7 



3. 3275+ 



1 4. 



9.2 — - 



17 



24.8 



3. 3545+ 

 3 3816 



1.5 



9.3 



17.1 



24.9. 



1.6 



9.4 



17.2 



25 — 



3 4088 



1.7 - 



9.5 



17.3 



25.1 



3. 4362 



1.8 



9.6 



17.4 



25.2 



3 4636 



1.9 



9.7 



17.5 



25.3 



3 4911 



2,_ . - - 



9.8 



17.6 



25.4.- 



3. 5188 



2.1 



9.9 



17.7 



25.5 



3 5466 



2.2 



10 



17.8 



25.6 



3 5744 



2.3 



10.1 



17.9 



25.7. 



3 6024 



2.4 



10.2... 



18 



25.8- . 



3. 6305+ 

 3. 6587 



2.5 



10.3 



18.1 



25.9 



2.6 



10.4 



18.2-. 



26 - - 



3 6870 



2.7 



10.5 



18.3 



26.1.. 



3 7154 



2.8 



10.6 



10.7 



1S.4._- 



26.2. . 



3. 7439 



2.9 



18.5- 



26.3 



3 7726 





10.8 



18.6 



26.4. 



3. 8013 



3.1 - 



10.9 -._ 



18.7 



26.5. 



3. 8302 . 



3.2 



11 



18.8 



26.6 



3 8591 



3.3 



11.1 



| 18.9 



26.7 



3 8882 



3.4. 



11.2 



19 



26.8- 



3. 9174 



3.5 - 



11.3 



19.1 



26.9 



27 



3. 9467 



3.6 



11.4 



19.2 



3 9761 



3.7 



11.5 - - 



19.3 



27.1- 



4 0056 



3.8 - -- 



11.6 



19.4 



27.2.. 



4 0352 



3.9 



11.7 



19.5- - 



27.3. - . 



4.0649 



4. _ 



11.8 



19.6 



27.4 



4 0948 



4.1 



11.9 



19.7 



27.5- 



4. 1247 



4.2 . - - 



12 . . 



19.8 



27.6. 



4.1548 



4.3 



12.1 



19.9 



27.7 



4. 1849 



4.4 . 



12.2 



12.3 . - 



20 



27.8 



4. 2152 



4.5 



20.1 



27.9 



4. 2456 



4.6 — 



12.4 



20.2 



28- 



4. 2761 



4.7 - 



12 5 



203 



28.1 



4.3067 



4.8 



12.6 



204 - - 



28.2 



4. 3374 



4.9 



12.7 



12.8 -- 



20.5 



28.3. 



4. 3682 



5 - 



20.6 



284 



4. 3991 



5.1 



12 9 



20 7 



28 5 



4.4301 



5.2 



13 . 



20.8 



28 6 



4. 4613 



5.3 



13.1 



20.9 



28.7 



28.8 . 



4. 4925+ 

 4. 5239 



5.4 .. 



13.2 



13.3 



13.4 



13.5 



13.6 



13.7 



13.8 



13.9 



14 



14.1 



14.2 



14.3 



14.4 



14.5 



14.6 



14.7 



14.8 



14.9 



15 



15.1 



15.2 



15.3 



15.4 



21 



5.5 



21.1 



2S.9- 



4. 5554 



5.6 - - 



21.2 



29 



4. 5869 



5.7 



21.3 



29.1 . . 



4. 6186 



5.8 



21.4 - _ 



29.2 _ . 



4.6504 



5.9 - 



21 5 



29.3 



4. 6823 



6. 



21.6 



29.4 - _ 



4.7144 



6.1 --- --- 



21.7 



29.5 



4. 7465- 



6.2 - 



21 8 



29 6 



4. 7787 



6.3 



21.9 



29.7 



4.8111 



6.4 



22 . - 



29.8. _ 



4. S435+ 

 4. 8761 



6.5 



22.1 



22.2 



22.3 



22.4 



22.5 



22.6 



22.7 



22.8 



22.9 



23 



23.1 



23.2 



23.3 



1 23.4 



299 - 



6.6 



30 - 



4. 90S7 



6.7 -- 



30 1 



4. 9415+ 

 4. 9744 



6.8 



30.2 



6.9 



3Q 3 



5 0074 



7 



30.4 



5. 0405+ 

 5. 0737 



7.1 



30.5 



7.2 



30 6 



5. 1071 



7.3 



30.7 



5. 1405— 



7.4 



30 8 



5. 1740 



7.5 



30.9 



31 



31.1 



5. 2077 



7.6 



5. 2414 



7.7 



15.5. 



5. 2753 



7.8 



15.6 



31.2 



5.3093 



1 x=3. 141592653(5; basal area in sq. 

 inches. 



ft. =0.005454l539i (0.00545415.1) times the square of the diameter in 



