A closed cylinder of base diameter 42 cm and
height 14 cm is dipped vertically one third in a
bucket full of paint. How much area gets painted?
Here is the link for the answer similar to your query:
https://www.meritnation.com/ask-answer/question/a-cylinder-of-base-diameter-8-cm-and-height-7-cm-is-dipped-v/surface-area-and-volume-of-a-cuboid-and-cube/6739580
https://www.meritnation.com/ask-answer/question/a-cylinder-of-base-diameter-8-cm-and-height-7-cm-is-dipped-v/surface-area-and-volume-of-a-cuboid-and-cube/6739580