var('x,y,z')
quadrics = {'Ellipsoid':x^2+y^2+z^2-1,'Elliptic paraboloid':x^2+y^2-z,'Hyperbolic paraboloid':x^2-y^2-z, '1-Sheeted Hyperboloid':x^2+y^2-z^2-1,'2-Sheeted Hyperboloid':x^2-y^2-z^2-1, 'Cone':x^2+y^2-z^2}
@interact
def quads(q = selector(quadrics.keys()), a = slider(0,5,1/2,default = 1)):
f = quadrics[q].subs({x:x*a^(1/2)})
if a==0 or q=='Cone': html('<center>$'+latex(f)+' \ $'+ '(degenerate)</center>')
else: html('<center>$'+latex(f)+'$ </center>')
p = implicit_plot3d(f,(x,-2,2),(y,-2,2),(z,-2,2), plot_points = 75)
show(p)
