$$\text { Find the area of the surface. The part of the surface } z = x y \text { that lies within the cylinder } x ^ { 2 } + y ^ { 2 } = 25 \text {. }$$

Short Answer

$$\text { Find the area of the surface. The part of the surface } z = x y \text { that lies within the cylinder } x ^ { 2 } + y ^ { 2 } = 25 \text {. }$$