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CIRCLES. 



To find, by means of the Table, the square or circle that 

 will contain the area of a board or surface of given length 

 and width. 



RULE. Find the area of the board or surface by multi- 

 plying its width by its length, and in the columns opposite 

 the area thus found, headed respectively " Diam." " Cir- 

 cum." and " Side of Equal Square" will be found the 

 dimensions of the circle and square that contains the area. 



EXAMPLE. What is the side of a square, and what the 

 diameter and circumference of a circle, that will contain the 

 same area as a board that is 22 inches wide by 12 feet long ? 



SOLUTION. 22 inches, width, x 144 inches, length, = 3168 

 square inches, area of board : Then, in the table, opposite 

 the area of 3166.9 (the nearest number to 3168) under the 

 columns headed respectively "Diam.," "Circum.," and 

 "Side of Equal Square," will be found 63J inches, diame- 

 ter, 109.4 inches, circumference, and 56.275 inches, side of 

 square. Ans. 



