Number:
18009
Author:
Issue:
ET Vol 68, May 1915
Tags:
Conic Sections (parabolas, ellipses, hyperbolas)
Solved by:
W.F. Beard, MQ Vol 105
Solved by:
J. Macmillan, MQ Vol 105
Solved by:
F.H. Peachell, MQ Vol 105