1. Plot: The sequence of events that form the structure of the story.
2. Characters: The individuals or entities who drive the story forward.
3. Setting: The time and place where the story occurs, providing context.
4. Theme: The central idea or message conveyed through the story.
In the adjoining figure, $\triangle CAB$ is a right triangle, right angled at A and $AD \perp BC$. Prove that $\triangle ADB \sim \triangle CDA$. Further, if $BC = 10$ cm and $CD = 2$ cm, find the length of AD. 