The Control (Ctrl) key is a modifier key on the keyboard used in combination with other keys to perform specific tasks quickly.
Examples:
- Ctrl + C: Copy selected content.
- Ctrl + V: Paste the copied content.
- Ctrl + Z: Undo the last action.
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. 