100 THE CORN LADY 



4. The area of a circle is about % that of a 

 square of the same diameter. The exact fraction is 

 .7854. So to find the area of a circle, multiply the 

 diameter by itself, and multiply the result by .7854, 

 which is the same as taking a little over % of it. 



5. The circumference (distance around) of a cir- 

 cle is a little more than three times the diameter. The 

 exact fraction is 3.1416. 



6. To find the contents of a pointed heap of corn, 

 find the area of the bottom of the pile in square 

 feet, and multiply that by half the height of the 

 highest point. This will give you the cubic feet, 

 which can be reduced to bushels. To find the con- 

 tents of a circular crib of corn, find the area of the 

 circular base, and multiply that by the height. This 

 will give the cubic feet. 



7. A ton of tame hay will about equal a space 

 8x8x8 feet. Wild hay, 7x7x7 feet. 



8. A barrel of water is about 4 cubic feet. 



9. A cubic foot of water weighs 621/2 pounds. 



10. An acre is 160 square rods; 43,560 square 

 feet; 4840 square yards. 



11. The board foot used in reckoning lumber is a 

 square foot an inch thick. 



12. A gallon is a trifle over % of a cubic foot. To 

 find the capacity of a tank, estimate the contents in 

 cubic feet, and multiply by 8 for the number of gal- 

 lons, and divide by 4 for the number of barrels. This 

 will be very nearly correct. 



