WEIGHTS AND MEASURES 19 



Or multiply the square of diameter by .7854 



Or multiply the square of circumference by .07958 



Or multiply the square of one-half diameter by 3.1416 



To Find Side of an Inscribed Square: 

 Multiply diameter by .7071 

 Or multiply circumference by .2251 

 Or divide circumference by 4.4428 



To Find Side of a Square of Equal Area: 

 Multiply diameter by .8862 

 Or divide diameter by 1.1284 

 Or multiply circumference by .2821 

 Or divide circumference by 3.545 



Square: 



A side multiplied by 1.4142 equals diameter of its circumscrib- 

 ing circle 



A side multiplied by 4.443 equals circumference of its circum- 

 scribing circle 



A side multiplied by 1.1284 equals diameter of a circle of equal 

 area 



A side multiplied by 3.545 equals circumference of an equal 

 circle 



To Find the Area of an Ellipse: 



Multiply the product of its axes by .7854 



Or multiply the product of its semi-axes by 3.14159 



RULES RELATIVE TO OTHER GEOMETRICAL FIGURES 



Contents of cylinder = area of end X length 



Contents of wedge = area triangular base X altitude 



Surface of cylinder = length X circumference + area of both ends 



Surface of sphere = diameter squared X 3.1416, or = diameter 



X circumference 



Contents of sphere = diameter cubed X .5236 

 Contents of pyramid or cone, right or oblique, regular or irregular 



= area of base X one-third altitude 



