MATHEMATICS 



XLV. THE REGULAR TETRAHEDRON IN RELATION 

 TO ITS CUBE AND OTHER SOLIDS 



Oscar Ingoid 



Medford, Oklahoma 



Abstracted by S. W. Reaves 



A regular tetrahedron ma}- be made from a cube by cutting 

 off four of its corners with planes, each of which passes through 

 three vertices, the edge, area of base, and volume of the tetrahedron 

 are compared with like parts of the cube from which it is cut, and 

 the radius of the circumscribed sphere is expressed in terms of the 

 edge of the tetrahedron. Models of these solids were exhibited and 

 printed copies of the paper were distributed. 



V 



^) 



eaJet=S/9e\^/ -/se:i^r/?2e:^i 



3'//. s ^// 3 



