Let $f ( x , y ) = \sqrt { x ^ { 2 } + y ^ { 2 } }$ .(a) Sketch the intersection of $z = f ( x , y )$ and $z = 1$ in the $x y$ -plane.(b) Sketch the intersection of $z = f ( x , y )$ and $x = 0$ in the $y z$ -plane.(c) Sketch the intersection of $z = f ( x , y )$ and $y = 1$ in the $x z$ -plane.(d) Sketch the graph of $z = f ( x , y )$ in $\mathbb { R } ^ { 3 }$ .

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The Answer of Let $f ( x , y ) = \sqrt { x ^ { 2 } + y ^ { 2 } }$ .(a) Sketch the intersection of $z = f ( x , y )$ and $z = 1$ in the $x y$ -plane.(b) Sketch the intersection of $z = f ( x , y )$ and $x = 0$ in the $y z$ -plane.(c) Sketch the intersection of $z = f ( x , y )$ and $y = 1$ in the $x z$ -plane.(d) Sketch the graph of $z = f ( x , y )$ in $\mathbb { R } ^ { 3 }$ .

Let f(x,y)=x2+y2f ( x , y ) = \sqrt { x ^ { 2 } + y ^ { 2 } }f(x,y)=x2+y2​

Let $f ( x , y ) = \sqrt { x ^ { 2 } + y ^ { 2 } }$