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Question:

A company packages its milk powder in cylindrical container whose base has a diameter of 14cm and height 20cm. Company places a label around the surface of the container (as shown in the figure). If the label is placed 2cm from top and bottom, what is the area of the label?

Solution:

Given:
d=14cm and h=20cm
⇒Height of the label = 20 - 2 - 2 = 16cm
⇒Radius = d/2 = 14/2 = 7cm
⇒Area of the label = 2πrh = 2 × 22/7 × 7 × 16 = 704 sq cm