Three precautions to be taken while removing stains are:
1. Act Quickly – The sooner you treat the stain, the easier it is to remove.
2. Test First – Test the cleaning agent on a hidden area of the fabric to ensure it does not cause damage or discoloration.
3. Avoid Rubbing – Do not rub the stain as it may spread or set the stain further into the fabric. Dab gently instead.
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.