Sketch the level curves of the function

f(x,y)=x2+y2\displaystyle {f{{\left({x},{y}\right)}}}={x}^{{2}}+{y}^{{2}}

for c=4,16,25\displaystyle {c}={4},{16},{25}.

12345678-1-2-3-4-5-6-7-812345678-1-2-3-4-5-6-7-8
Clear All Draw: LineParabolaAbsolute valueExponentialCircleEllipseVertical hyperbolaHorizontal hyperbolaCosineSine