Find the Area of the Surface $S$ Where $S$ Is the Part of the Sphere

Short Answer

Find the area of the surface $S$ where $S$ is the part of the sphere $x ^ { 2 } + y ^ { 2 } + z ^ { 2 } = 9$ that lies to the right of the $x z$ -plane and inside the cylinder $x ^ { 2 } + z ^ { 2 } = 4$ .