1=4x2+9y2 is an equation of an ellipse, and is equivalent to 4x2+9y2=1.
It is centered at (0,0).
Its foci are (0,5) and (0,−5).
Its minor axis has length 4 with endpoints (−2,0) and (2,0).
Its major axis has length 6 with endpoints (0,−3) and (0,3).
The ellipse has parameterization: x(θ)y(θ)=2sin(θ)=3cos(θ)