1. Jallianwala Bagh Massacre: The brutal killing of innocent people by British troops at Amritsar in 1919 shocked the nation and fueled anger.
2. Rowlatt Act: The oppressive act of 1919 allowed the government to arrest people without trial, leading to widespread protests.
3. Khilafat Movement: Gandhi supported the movement to unite Hindus and Muslims against British rule, making it a key cause of the Non-Cooperation Movement.
On the day of her examination, Riya sharpened her pencil from both ends as shown below. 
The diameter of the cylindrical and conical part of the pencil is 4.2 mm. If the height of each conical part is 2.8 mm and the length of the entire pencil is 105.6 mm, find the total surface area of the pencil.