*(1)(a) Find a formula for the intersection of a cone {(x,y,z):
x^2+y^2=z^2} with a plane {(x,y,z): z=c}.
(b) Find a formula for the intersection of a cone {(x,y,z):
x^2+y^2=z^2} with a plane {(x,y,z): x=a}.
(c) Find a formula for the intersection of a cone {(x,y,z):
x^2+y^2=z^2} with a plane {(x,y,z): y=b}.
*(2) Find a formula for the intersection of a cone {(x,y,z):
x^2+y^2=z^2} with a plane {(x,y,z): z=kx+b} assuming both b and k
are positive.
(a) For what value of...