An exclamatory sentence expresses strong emotion or feeling, such as surprise, excitement, or anger. It is characterized by the use of an exclamation mark at the end.
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.