12 MISC. PUBLICATION 2 2 5, U. S. DEPT. OF AGRICULTURE 



Table 19. — Area of large circles and squares 



Eadius of 



Side of 



Area in 



Area in 



circles 



squares 



square feet 



acres 



Feet Inches 



Feet Inches 







3 9 



6 7 



43. 6 



0.001 



5 



8 10 



78.5 



.0018 



5 7V 2 



10 



100 



.0023 



6 



10 8 



113.1 



.0026 



7 6 



13 4 



176.7 



.0041 



8 



14 2 



201.1 



.0046 



10 



17 8 



314.2 



.0072 



11 SV 2 



20 



400 



.0092 



11 9V 2 



20 11 



436 



.010 



12 6 



22 2 



491 



.011 



12 7V 2 



22 4 



500 



.011 



15 



26 7 



707 



.016 



17 10 



31 7 



1000 



.023 



18 7V 2 



33 



1089 



.025 



25 



44 4 



1963 



.045 



26 4 



46 8 



2178 



.05 



28 2Y 2 



50 



2500 



.057 



30 



53 2 



2827 



.065 



30 11 



54 9 



3000 



.069 



32 3 



57 2 



3267 



.075 



33 



58 6 



3421 



.079 



35 8 



63 3 



4000 



.092 



37 3 



66 



4356 



.1 



37 6 



66 6 



4418 



.101 



39 10^ 



70 8 



5000 



.115 



50 



88 7 



7854 



.180 



52 8 



93 4 



8712 



.2 



58 10^ 



104 5 



10890 



.25 



64 6 



114 4 



13068 



.3 



66 



116 11 



13685 



.31 



68 



120 6 



14520 



.33^ 



69 1 



122 6 



15000 



.34 



74 bV 2 



132 



17424 



.4 



79 93^ 



141 5 



20000 



.46 



83 3 



147 7 



21780 



.5 



ioi uy 2 



180 9 



32670 



.75 



117 9 



208 8 



43560 



1.0 



Table 20. — Number of trees per acre by various methods of spacing 



Spacing (feet) Trees 



2X2_. 

 3X3- 

 4X4- 

 4X5- 

 4X6- 

 4X7-. 

 4X8- 

 4X9- 

 4X10. 

 5X5- 

 5X6- 

 5X7- 

 5X8- 

 5X9- 

 5X10. 

 6X6- 

 6X7- 

 6X8- 

 6X9- 

 6X10. 

 6X12. 

 6X15. 

 7X7- 

 7X8. 



Number 



10, 890 



4,840 



2,722 



2,178 



1,815 



1, 553 



1,361 



1, 210 



1,089 



1,742 



1,452 



1,245 



1,089 



968 



871 



1,210 



1,037 



908 



807 



726 



605 



484 



889 



778 



Spacing (feet) 



7X9- 



7X10. 



7X12. 



7X15. 



8X8- 



8X9- 



8X10. 



8X12. 



8X15. 



8X25. 



9X9- 



9X10. 



9X12. 



9X15. 

 10X10. 

 10X12 

 10X15. 

 10X18. 

 11X11 

 11X12. 

 11X15. 

 11X20. 

 11X25. 

 12X12. 



Trees 



Number 

 691 

 622 

 519 

 415 

 681 

 605 

 544 

 454 

 363 

 218 

 538 

 484 

 403 

 323 

 436 

 363 

 290 

 242 

 360 

 330 

 264 

 198 

 158 

 302 



Spacing (feet) 



12X15 

 12X18 

 12X20 

 12X25 

 13X13 

 13X15 

 13X20. 

 13X25. 

 14X14. 

 14X15. 

 14X20 

 14X25. 

 15X15. 

 15X20 

 15X25. 

 16X16. 

 16X20 

 16X25. 

 18X18 

 18X20. 

 18X25. 

 20X20. 

 20X25. 

 25X25. 



Trees 



Number 

 242 

 202 

 182 

 145 

 258 

 223 

 168 

 134 

 222 

 207 

 156 

 124 

 194 

 145 

 116 

 170 

 136 

 109 

 134 

 121 

 97 

 109 

 87 

 70 



