TY  - BOOK
AU  - Henderson,David W.
AU  - Moura,Eduarda
TI  - Experiencing geometry: on plane and sphere 
SN  - 0133737705
PY  - 1996///
CY  - Englewood Cliffs, N.J.
PB  - Prentice Hall
KW  - Geometry
N1  - Includes bibliographical references (p. 177-188) and index; Straightness and symmetry--Straightness on a sphere--What is an angle?--Straightness on cylinder and cone
ER  -